Update to release v3.4.1

.github/CONTRIBUTING.md

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+Contributing to yii2-widgets
+============================
+Looking to contribute something to yii2-widgets? **Here's how you can help.**
+
+Please take a moment to review this document in order to make the contribution
+process easy and effective for everyone involved.
+
+Following these guidelines helps to communicate that you respect the time of
+the developers managing and developing this open source project. In return,
+they should reciprocate that respect in addressing your issue or assessing
+patches and features.
+
+Using the issue tracker
+-----------------------
+When [reporting bugs][reporting-bugs] or
+[requesting features][requesting-features], the
+[issue tracker on GitHub][issue-tracker] is the recommended channel to use.
+
+The issue tracker **is not** a place for support requests. Refer the 
+[extension documentation and demos](http://demos.krajee.com/widgets) and/or refer to the
+[webtips Q & A forum](http://webtips.krajee.com/questions) which are the better places to get help.
+
+Reporting bugs with yii2-widgets
+--------------------------------
+We really appreciate clear bug reports that _consistently_ show an issue
+_within yii2-widgets_.
+
+The ideal bug report follows these guidelines:
+
+1. **Use the [GitHub issue search][issue-search]**  — Check if the issue
+   has already been reported.
+2. **Check if the issue has been fixed**  — Try to reproduce the problem
+   using the code in the `master` branch.
+3. **Isolate the problem**  — Try to share a demo or a test case that
+   consistently reproduces the problem.
+
+Please try to be as detailed as possible in your bug report, especially if an
+isolated test case cannot be made. Some useful questions to include the answer
+to are:
+
+- What steps can be used to reproduce the issue?
+- What is the bug and what is the expected outcome?
+- What browser(s) and Operating System have you tested with?
+- Does the bug happen consistently across all tested browsers?
+- What version of jQuery are you using? And what version of yii2-widgets?
+- Are you using yii2-widgets with other plugins?
+
+All of these questions will help others fix and identify any potential bugs.
+
+Requesting features in yii2-widgets
+------------------------------------------
+Before starting work on a major feature for yii2-widgets, **read the
+[documentation](http://demos.krajee.com/widgets)  first** or you may risk spending a considerable amount of
+time on something which the project developers are not interested in bringing into the project.
+
+### Submitting a pull request
+
+We use GitHub's pull request system for submitting patches. Here are some
+guidelines to follow when creating the pull request for your fix.
+
+1. Make sure to create a ticket for your pull request. This will serve as the
+bug ticket, and any discussion about the bug will take place there. Your pull
+request will be focused on the specific changes that fix the bug.
+2. Make sure to reference the ticket you are fixing within your pull request.
+This will allow us to close off the ticket once we merge the pull request, or
+follow up on the ticket if there are any related blocking issues.
+3. Explain why the specific change was made. Not everyone who is reviewing your
+pull request will be familiar with the problem it is fixing.
+4. Run your tests first. If your tests aren't passing, the pull request won't
+be able to be merged. If you're breaking existing tests, make sure that you
+aren't causing any breaking changes.
+5. Only include source changes. While it's not required, only including changes
+from the `src` directory will prevent merge conflicts from occuring. Making
+this happen can be as a simple as not committing changes from the `dist`
+directory.
+
+By following these steps, you will make it easier for your pull request to be
+reviewed and eventually merged.
+
+Triaging issues and pull requests
+---------------------------------
+Anyone can help the project maintainers triage issues and review pull requests.
+
+### Handling new issues
+
+yii2-widgets regularly receives new issues which need to be tested and organized.
+
+When a new issue that comes in that is similar to another existing issue, it
+should be checked to make sure it is not a duplicate.  Duplicates issues should
+be marked by replying to the issue with "Duplicate of #[issue number]" where
+`[issue number]` is the url or issue number for the existing issue.  This will
+allow the project maintainers to quickly close off additional issues and keep
+the discussion focused within a single issue.
+
+If you can test issues that are reported to yii2-widgets that contain test cases and
+confirm under what conditions bugs happen, that will allow others to identify
+what causes a bug quicker.
+
+### Reviewing pull requests
+
+It is very common for pull requests to be opened for issues that contain a clear
+solution to the problem.  These pull requests should be rigorously reviewed by
+the community before being accepted.  If you are not sure about a piece of
+submitted code, or know of a better way to do something, do not hesitate to make
+a comment on the pull request.
+
+### Reviving old tickets
+
+If you come across tickets which have not been updated for a while, you are
+encouraged to revive them. While this can be as simple as saying `:+1:`, it is
+best if you can include more information on the issue. Common bugs and feature
+requests are more likely to be fixed, whether it is by the community or the
+developers, so keeping tickets up to date is encouraged.
+
+Licensing
+---------
+
+It should also be made clear that **all code contributed to yii2-widgets** must be
+licensable under the [BSD-3-Clause license][licensing].  Code that cannot be released
+under this license **cannot be accepted** into the project.
+
+[issue-search]: https://github.com/kartik-v/yii2-widgets/search?q=&type=Issues
+[issue-tracker]: https://github.com/kartik-v/yii2-widgets/issues
+[licensing]: https://github.com/kartik-v/yii2-widgets/blob/master/LICENSE.md
+[reporting-bugs]: #reporting-bugs-with-yii2-widgets
+[requesting-features]: #requesting-features-in-yii2-widgets

.github/ISSUE_TEMPLATE.md

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+## Prerequisites
+
+- [ ] I have searched for similar issues in both open and closed tickets and cannot find a duplicate.
+- [ ] The issue still exists against the latest `master` branch of yii2-widgets.
+- [ ] This is not an usage question. I confirm having gone through and read the [documentation and demos](http://demos.krajee.com/widgets).
+- [ ] This is not a general programming / coding question. (Those should be directed to the [webtips Q & A forum](http://webtips.krajee.com/questions)).
+- [ ] I have attempted to find the simplest possible steps to reproduce the issue.
+- [ ] I have included a failing test as a pull request (Optional).
+
+## Steps to reproduce the issue
+
+1.
+2.
+3.
+
+## Expected behavior and actual behavior
+
+When I follow those steps, I see...
+
+I was expecting...
+
+## Environment
+
+#### Browsers
+
+- [ ] Google Chrome
+- [ ] Mozilla Firefox
+- [ ] Internet Explorer
+- [ ] Safari
+
+#### Operating System
+
+- [ ] Windows
+- [ ] Mac OS X
+- [ ] Linux
+- [ ] Mobile
+
+#### Libraries
+
+- jQuery version:
+- yii2-widgets version:
+
+## Isolating the problem
+
+- [ ] This bug happens [on the demos page](https://demos.krajee.com/widgets)
+- [ ] The bug happens consistently across all tested browsers
+- [ ] This bug happens when using yii2-widgets without other plugins.

.github/PULL_REQUEST_TEMPLATE.md

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+## Scope
+This pull request includes a
+
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Translation
+
+## Changes
+The following changes were made (this change is also documented in the [change log](https://github.com/kartik-v/yii2-widgets/blob/master/CHANGE.md)):
+
+-
+-
+-
+
+## Related Issues
+If this is related to an existing ticket, include a link to it as well.