patch 8.2.2016: swap file test is a little flaky

Problem:    Swap file test is a little flaky.
Solution:   Don't set a byte to a fixed value, increment it.
diff --git a/src/version.c b/src/version.c
index 1170a7f..01cf3c9 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2016,
+/**/
     2015,
 /**/
     2014,