change head shortcut

views/main/CodeMirror/editor.js

@@ -32,8 +32,8 @@ module.exports = (() => {
         'Ctrl-`': toggleComment,
         'Ctrl-L': toggleUnOrderedList,
         'Ctrl-Alt-L': toggleOrderedList,
-        'Ctrl-[': toggleHeader,
-        'Ctrl-]': toggleUnHeader,
+        'Ctrl-]': toggleHeader,
+        'Ctrl-[': toggleUnHeader,
         'Ctrl-=': toggleBlockquote,
         'Ctrl--': toggleUnBlockquote,
         'Ctrl-U': drawLink,