Upgraded to JDK 11 in jitpack builds

Upgraded to JDK 11 in jitpack builds.

0.2.x branch release

Upgraded to rxjava 2.2.12

0.2.x branch release

Upgraded to rxjava 2.2.11

Transaction rollback support

0.1-RC38-beta2

Transaction rollback support added

Transaction reference count fixed

0.1-RC38-beta1

Merge remote-tracking branch 'upstream/master'

Transaction reference count fixed

0.1-RC34-beta2

Transaction usage counter management fixed

0.1-RC34-beta1

Fixed transaction support