typo

Author: mattn

autoload/gist.vim

@@ -1085,7 +1085,7 @@ let s:extmap = extend({
 \".sml": "sml",
 \".sql": "sql",
 \".st": "smalltalk",
-\".switf": "switf",
+\".swift": "swift",
 \".tcl": "tcl",
 \".tcsh": "tcsh",
 \".tex": "tex",