patch 8.0.1491: the minimum width of the popup menu is hard coded

Problem:    The minimum width of the popup menu is hard coded.
Solution:   Add the 'pumwidth' option. (Christian Brabandt, James McCoy,
            closes #2314)
diff --git a/src/version.c b/src/version.c
index 0a54751..1bd0295 100644
--- a/src/version.c
+++ b/src/version.c
@@ -772,6 +772,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1491,
+/**/
     1490,
 /**/
     1489,