patch 8.2.0020: mouse clicks in the command line not tested

Problem:    Mouse clicks in the command line not tested.
Solution:   Add tests. (Dominique Pelle, closes #5366)
diff --git a/src/version.c b/src/version.c
index 67d4918..a96c906 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    20,
+/**/
     19,
 /**/
     18,