1.0.0-beta.30

First release distributed on Maven Central

JFrog is shutting down JCenter, which has been the de facto place for distributing Android libraries. This means we need to move to distributing through Maven Central instead. This version has no functional differences to 1.0.0-beta29, but it is advised to move to this release anyway, as 1.0.0-beta29 and earlier will cease to be available when JCenter shuts down.