Merge pull request #7830 from nextcloud/bumpMasterTo3.16

Bump master to 3.16 apha

build.gradle

@@ -82,7 +82,7 @@ repositories {
 
 // semantic versioning for version code
 def versionMajor = 3
-def versionMinor = 15
+def versionMinor = 16
 def versionPatch = 0
 def versionBuild = 0 // 0-50=Alpha / 51-98=RC / 90-99=stable