patch 8.2.2019: swap file test fails on MS-Windows

Problem:    Swap file test fails on MS-Windows.
Solution:   Add four to the process ID. (Ken Takata, closes #7333)
diff --git a/src/version.c b/src/version.c
index ebfe94c..70ebd9c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2019,
+/**/
     2018,
 /**/
     2017,