First 0.9 beta

Newest release on master branch. The major change is upgrade to Simple Bridge v2, but not limited to that. Other changes include Erlang 20 support, dozen of bugs fixed and some improvements to tests and code quality.

This release marked as beta, but should be pretty stable. While updating from v0.8.x, just read UPGRADE.md file and follow instructions.

Marathon for final 0.9 release started, join us.