patch 8.1.0316: swapinfo() test fails on Travis

Problem:    swapinfo() test fails on Travis.
Solution:   Handle a long host name. (Ozaki Kiichi, closes #3361)
            Also make the version check flexible. (James McCoy)
diff --git a/src/version.c b/src/version.c
index 6b79b6e..0ffd11e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -795,6 +795,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    316,
+/**/
     315,
 /**/
     314,