Update README.md

Author: staticfloat

README.md

@@ -1,3 +1,5 @@
 ## objconv
 
-This is a git mirror of [objconv](http://www.agner.org/optimize/), by Agner Fog.  All rights belong to Agner Fog.  As of this writing, this repository contains version 2.49 of objconv.
+This is a git mirror of [objconv](http://www.agner.org/optimize/), by Agner Fog.  All rights belong to Agner Fog.  As of this writing, this repository contains version 2.53 of objconv.
+
+To regenerate this repository, run `./update.sh`.