Added self check option in executable name

Author: rijnb

README.md

@@ -50,6 +50,9 @@ decode Mapcodes.
 
     Bug fix for state IN-DD (in India).
 
+    If the executable name contains "debug", the self checking mechanism is activated. Note, however, that
+    this feature is under construction and produces false negative for certain decodes. 
+    
 * 1.50
 
     Major release. This version is not backwards compatible with mapcode 1.4x: is has dropped support for