patch 8.0.0760: terminal window colors wrong with 'termguicolors'

Problem:    Terminal window colors wrong with 'termguicolors'.
Solution:   Add 'termguicolors' support.
diff --git a/src/version.c b/src/version.c
index c1c68e3..00580c7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    760,
+/**/
     759,
 /**/
     758,