chore(*): Prepare to release.

Closes angulardart#838

PiperOrigin-RevId: 184690970

fix(travis): Pin to 2.0.0-dev.17.0 SDK.

We can revert this after dart-lang/sdk#31940 is fixed.

Temporary workaround for angulardart#789

PiperOrigin-RevId: 182429134

Fix pubspec for angular_forms and angular_test to publish.

PiperOrigin-RevId: 181220132

fix(angular_compiler): Add dep override for angular_ast.

PiperOrigin-RevId: 179480913

Add missing LICENSE file angular_ast package.

PiperOrigin-RevId: 171731778

Prepare angular_router pubspec and changelog for 2.0.0-alpha release.

PiperOrigin-RevId: 169967848

fix(CHANGELOG): Haven't released 4.x yet.

PiperOrigin-RevId: 167025174

refactor(Compiler): Start removing `UrlResolver` from the public API.

This prepares for moving `UrlResolver` into another library.

PiperOrigin-RevId: 166373309

fix(angular_forms): Add missing dependencies for func and meta.

PiperOrigin-RevId: 165364790