UPBGE: UPBGE 0.3 - version bump -> release

I want to express my appreciation to all the developers (present and
past), users, documenters and to all our internet friends who have made
this release possible. Thank you very much.

Author: lordloki

source/blender/blenkernel/BKE_blender_version.h

@@ -41,7 +41,7 @@ extern "C" {
 
 #define UPBGE_VERSION_PATCH 0
 /** alpha/beta/rc/release, docs use this. */
-#define UPBGE_VERSION_CYCLE rc
+#define UPBGE_VERSION_CYCLE release
 
 /* Blender file format version. */
 #define BLENDER_FILE_VERSION BLENDER_VERSION