Release 0.28.5 (dart-lang#2011)

Prepare to publish 0.28.4 (dart-lang#1989)

* Prepare to publish 0.28.4

* build

Bump markdown dependency (dart-lang#1954)

Bump markdown dependency

Fix iOS scroll physics (dart-lang#1950)

* Fix iOS scroll physics

* update changelog and bump version

Adding youtube directive for embedding YouTube videos (dart-lang#1947)

* Adding youtube directive for embedding YouTube videos

* ++

* ++

* Simplify URL format

* fix test counter

* bump pupspec and Changelog

* typo

* Improve regex + text

* grind build

* remove extra print

* Always use all available horizontal space

* Always use all available horizontal space

* feedback

Prepare for 0.28.2 (dart-lang#1935)

Prepare for 0.28.1+2 and fix search box alignment in Safari (dart-lan…

…g#1927)

Prepare for 0.28.1+1 (fix hamburger icon) (dart-lang#1925)

Prepare for dartdoc 0.28.1 (dart-lang#1920)

* Prepare for dartdoc 0.28.1

* Add the upcoming fix to three-pane scrolling to the changelog

Prepare for 0.28.0. (dart-lang#1902)

* Update CHANGELOG and version number for 0.28.0

* Add appveyor status to README