patch 8.2.1594: pull requests on github do not notify a maintainer

Problem:    Pull requests on github do not notify a maintainer.
Solution:   Add a CODEOWNERS file with a few initial entries.
diff --git a/src/version.c b/src/version.c
index 7058d62..bd15f3d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1594,
+/**/
     1593,
 /**/
     1592,