Change Log: `yii2-widget-depdrop`

Version 1.0.1

Date: 09-Oct-2018

Bump composer dependencies.
Add Bootstrap 4.x support.
Reorganize all source code in src directory.
Add github contribution and issue/PR log templates.
Update copyright year to current.

Version 1.0.0

Date: 08-Nov-2014

Initial release
Sub repo split from yii2-widgets