patch 7.4.777

Problem:    The README file doesn't look nice on github.
Solution:   Add a markdown version of the README file.

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    777,
 /**/
     776,
 /**/