patch 8.2.1635: no digraph for 0x2022 BULLET

Problem:    No digraph for 0x2022 BULLET.
Solution:   Use "oo". (Hans Ginzel, closes #6904)

src/digraph.c

@@ -1173,6 +1173,7 @@ static digr_T digraphdefault[] =
 	{'9', '"', 0x201f},
 	{'/', '-', 0x2020},
 	{'/', '=', 0x2021},
+	{'o', 'o', 0x2022},
 	{'.', '.', 0x2025},
 	{',', '.', 0x2026},
 	{'%', '0', 0x2030},

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1635,
 /**/
     1634,
 /**/