Bump version number in prep for release

Author: gnunn1

source/gx/terminix/constants.d

@@ -28,7 +28,7 @@ enum APPLICATION_ID = "com.gexperts.Terminix";
 
 // Application values used in About Dialog
 enum APPLICATION_NAME = "Terminix";
-enum APPLICATION_VERSION = "0.53.0";
+enum APPLICATION_VERSION = "0.54.0";
 enum APPLICATION_AUTHOR = "Gerald Nunn";
 enum APPLICATION_COPYRIGHT = "Copyright \xc2\xa9 2016 " ~ APPLICATION_AUTHOR;
 enum APPLICATION_COMMENTS = "A VTE based terminal emulator for Linux";