Update CodeMirror version (#1925)

to fix issue#1003

Author: hidaiy

package.json

@@ -53,7 +53,7 @@
     "@rokt33r/season": "^5.3.0",
     "aws-sdk": "^2.48.0",
     "aws-sdk-mobile-analytics": "^0.9.2",
-    "codemirror": "^5.19.0",
+    "codemirror": "^5.37.0",
     "codemirror-mode-elixir": "^1.1.1",
     "electron-config": "^0.2.1",
     "electron-gh-releases": "^2.0.2",