Release v2.6.3

Author: GiovanniBussi

CHANGES/v2.6.md

@@ -77,7 +77,7 @@ For users:
 - Updated patches:
   - added gromacs 2020.4 (experimental: it does not yet support modular simulator) 
 
-## Version 2.6.3
+## Version 2.6.3 (Apr 16, 2021)
 
 For users:
 - Includes all fixes up to 2.5.7

VERSION

@@ -5,4 +5,4 @@
 # (this is same as gromacs)
 # Notice that "plumed info --version" will return only 2.X
 # and "plumed info --long-version" will return the full string
-2.6.2
+2.6.3