patch 9.0.1152: class "implements" argument not implemented

Problem:    Class "implements" argument not implemented.
Solution:   Implement "implements" argument.  Add basic checks for when a
            class implements an interface.
diff --git a/src/version.c b/src/version.c
index 78fad97..74af145 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1152,
+/**/
     1151,
 /**/
     1150,