VERSION.cmake: master is now 2.2

VERSION.cmake

@@ -1,5 +1,5 @@
 set( MIRALL_VERSION_MAJOR 2 )
-set( MIRALL_VERSION_MINOR 1 )
+set( MIRALL_VERSION_MINOR 2 )
 set( MIRALL_VERSION_PATCH 0 )
 set( MIRALL_SOVERSION 0 )