patch 8.1.1279: cannot set 'spellang' to "sr@latin"

Problem:    Cannot set 'spellang' to "sr@latin". (Bojan Stipic)
Solution:   Allow using '@' in 'spellang'. (closes #4342)
diff --git a/src/version.c b/src/version.c
index 0b47695..8ab83c3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1279,
+/**/
     1278,
 /**/
     1277,