VERSION: master branch is 2.4

VERSION.cmake

@@ -1,7 +1,7 @@
 set( MIRALL_VERSION_MAJOR 2 )
-set( MIRALL_VERSION_MINOR 3 )
-set( MIRALL_VERSION_PATCH 1 )
-set( MIRALL_VERSION_YEAR  2016 )
+set( MIRALL_VERSION_MINOR 4 )
+set( MIRALL_VERSION_PATCH 0 )
+set( MIRALL_VERSION_YEAR  2017 )
 set( MIRALL_SOVERSION 0 )
 
 if ( NOT DEFINED MIRALL_VERSION_SUFFIX )