patch 8.2.0082: when reusing a buffer listeners are not cleared

Problem:    When reusing a buffer listeners are not cleared. (Axel Forsman)
Solution:   Clear listeners when reusing a buffer. (closes #5431)
diff --git a/src/version.c b/src/version.c
index cff754f..6dd07bb 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    82,
+/**/
     81,
 /**/
     80,