Start development of version 3.0.0-alpha1.

Author: greenrobot-team

build.gradle

@@ -4,7 +4,7 @@ version = ob_version
 buildscript {
     ext {
         // Typically, only edit those two:
-        def objectboxVersionNumber = '2.5.2' // without "-SNAPSHOT", e.g. '2.5.0' or '2.4.0-RC'
+        def objectboxVersionNumber = '3.0.0-alpha1' // without "-SNAPSHOT", e.g. '2.5.0' or '2.4.0-RC'
         def objectboxVersionRelease = false  // set to true for releasing to ignore versionPostFix to avoid e.g. "-dev" versions
 
         // version post fix: '-<value>' or '' if not defined; e.g. used by CI to pass in branch name