bump version to 3.1.1

main.ml

@@ -45,7 +45,7 @@ exception Abort
 exception Completion of string
 
 
-let version = 3100
+let version = 3101
 let version_major = version / 1000
 let version_minor = (version mod 1000) / 100
 let version_revision = (version mod 100)