README: stop using the codescan-diff name

We do not seem to use it anywhere else.

Author: kdudka

README

@@ -7,8 +7,8 @@ can find the up2date sources in the following repository:
 
     https://github.com/csutils/csdiff
 
-The codescan-diff utilities are licensed under GPLv3+, see COPYING for details.
-Please report bugs and feature requests on GitHub using the above URL.
+The project is licensed under GPLv3+, see COPYING for details.  Please report
+bugs and feature requests on GitHub using the above URL.
 
 
 Dependences