Fixes tests and deprecation warnings for Dart2

[pulyaevskiy]

No description provided.

[pulyaevskiy]

Build failed on stable Dart 1.24. Not sure if the library expected to support 1.x. Looks like it targets Flutter which is all-in with Dart2.

[Hixie]

cc @yjbanov

[yjbanov]

This is great! Thanks for the upgrade!

[yjbanov]

Can we assert after this line that memberName is #post? Also, let's use { } for the if block so that the return statement gets its own line.

[yjbanov]

I think here we can also assert that only post is being called.

[yjbanov]

Let's echo the name of the file we're running. Alternatively, set -x should have roughly the same effect.

[pulyaevskiy]

Thanks for taking a look! All comments should be addressed now.

[yjbanov]

This makes Dart 1 sad. Here's the plan. How about we do this PR first: #11. Then in this PR, we'll bump the version number to 2.0.0. From then on, if you are Dart 1, you have to use a version <2.0.0, and if you are on Dart 2, then you use version >=2.0.0. WDYT?

[pulyaevskiy]

Yeah, sgtm! Maybe also tag 1.0.0 so that it’s easier to backport any fixes, as a suggestion.

[yjbanov]

I was about to tag it, then realized I forgot to update the changelog (#12)

[yjbanov]

Ok, tagged as https://github.com/flutter/sentry/releases/tag/1.0.0

[yjbanov]

So here's the TODO list for this PR:

• bump version number to 2.0.0
• create a new entry in CHANGELOG.md

[pulyaevskiy]

Just pushed updates.
.travis.yml might need to be updated as well to exclude stable.

[yjbanov]

Thanks for fixing this! LGTM