updated for version 7.3.536

Problem:    When spell checking the German sharp s is not seen as a word
            character. (Aexl Bender)
Solution:   In utf_islower() return true for the sharp s. Note: also need
            updated spell file for this to take effect.

src/version.c

@@ -714,6 +714,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    536,
 /**/
     535,
 /**/