rephrased slack message & ready to release 2.1.0

fixed filter issues/prs click event and released 2.0.1

releasing 2.0.0

fixing progaurd releasing production.

released 1.9.1 fixing push event icon bug in lollipop.

made contributors list clickable

Merge pull request k0shk0sh#313 from thermatk/fdroid

satisfy f-droid and change CI tasks for flavors

released 1.8.1

ready for 1.8.0

reading for 1.7.0