Add a controller which can be used to know the offset of the current …

…sticky header

Merge pull request #26 from ened/flutter-1.6.0

Support for Flutter 1.6.0 (new error formats)

Removed print call and bumped version 0.3.4

Bumped version 0.3.3

add Dart 2 support

Fixes #7

Merge pull request #6 from letsar/feature/pinned-state

Feature/pinned state

Bumped version number to 0.2.0

fix warnings