patch 8.1.0916: with Python 3.7 "find_module" is not made available

Problem:    With Python 3.7 "find_module" is not made available.
Solution:   Also add "find_module" with Python 3.7. (Joel Frederico,
            closes #3954)
diff --git a/src/version.c b/src/version.c
index d0255a1..7614566 100644
--- a/src/version.c
+++ b/src/version.c
@@ -784,6 +784,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    916,
+/**/
     915,
 /**/
     914,