patch 8.1.0220: Ruby converts v:true and v:false to a number

Problem:    Ruby converts v:true and v:false to a number.
Solution:   Use Qtrue and Qfalse instead. (Masataka Pocke Kuwabara,
            closes #3259)
diff --git a/src/version.c b/src/version.c
index 4ea5c75..d69a8c7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -799,6 +799,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    220,
+/**/
     219,
 /**/
     218,