patch 8.1.0862: no verbose version of character classes

Problem:    No verbose version of character classes.
Solution:   Add [:ident:], [:keyword:] and [:fname:]. (Ozaki Kiichi,
            closes #1373)

src/version.c

@@ -783,6 +783,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    862,
 /**/
     861,
 /**/