V0.31.6

Enhancements

• Output lint reports only if it fails (e1ea872)
• Move okbuck to generate modern manifest skeleton based android_binary rules (#560)
• Add ability to customize kotlin version independent of classpath dependencies (51d6be5)
• Do not generate lint rules for instrumentation sources (d38c68d)

Bugfixes

• Do not use manifest_skeleton for instrumentation apk rules (9412088)
• Set package_type in android_binary rules (9994d90). Thie ensures the DEBUG constant in the apk's BuildConfig is generated correctly