patch 8.0.0855: MS-Windows: can't get tty name of terminal

Problem:    MS-Windows: can't get tty name of terminal.
Solution:   Use the winpty process number. (Yasuhiro Matsumoto, closes #1929)
diff --git a/src/version.c b/src/version.c
index 25750b5..bf30da6 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    855,
+/**/
     854,
 /**/
     853,