patch 8.0.1424: the timer_pause test is flaky on Travis

Problem:    The timer_pause test is flaky on Travis.
Solution:   Accept a longer sleep time on Mac.
diff --git a/src/version.c b/src/version.c
index 6b3df0d..4f8dfd2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -772,6 +772,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1424,
+/**/
     1423,
 /**/
     1422,