patch 8.0.0563: crash when getting the window position in tmux

Problem:    Crash when getting the window position in tmux. (Marvin Schmidt)
Solution:   Add t_GP to the list of terminal options. (closes #1627)
diff --git a/src/version.c b/src/version.c
index 1681694..bef2bfd 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    563,
+/**/
     562,
 /**/
     561,