Release/5.6.0 (#445)
Release/5.6.0 (#445)

* bump beta (betas below 9 are in other branch)

* bump beta

* bump beta

* release 5.6.0
Leanplum/Leanplum-Android-SDK,Leanplum/Leanplum-Android-SDK,Leanplum/Leanplum-Android-SDK,Leanplum/Leanplum-Android-SDK