Bump version year to 2020

Signed-off-by: Michael Schuster <michael@schuster.ms>

VERSION.cmake

@@ -1,7 +1,7 @@
 set( MIRALL_VERSION_MAJOR 2 )
 set( MIRALL_VERSION_MINOR 7 )
 set( MIRALL_VERSION_PATCH 0 )
-set( MIRALL_VERSION_YEAR  2019 )
+set( MIRALL_VERSION_YEAR  2020 )
 set( MIRALL_SOVERSION 0 )
 
 if ( NOT DEFINED MIRALL_VERSION_SUFFIX )