remove trailing whitespaces from source files

README

@@ -95,5 +95,5 @@ Online presence
 * The cgit homepage is hosted by cgit at <http://git.zx2c4.com/cgit/about/>
 
 * Patches, bug reports, discussions and support should go to the cgit
-  mailing list: <cgit@lists.zx2c4.com>. To sign up, visit 
+  mailing list: <cgit@lists.zx2c4.com>. To sign up, visit
   <http://lists.zx2c4.com/mailman/listinfo/cgit>