Update dependency codemirror to v5.39.2

Author: renovate-bot

package.json

@@ -50,7 +50,7 @@
     "babel-polyfill": "6.26.0",
     "babel-preset-es2015": "6.24.1",
     "babel-preset-react": "6.24.1",
-    "codemirror": "5.33.0",
+    "codemirror": "5.39.2",
     "css-loader": "0.28.9",
     "eslint": "4.16.0",
     "eslint-plugin-react": "7.5.1",

yarn.lock

@@ -1591,9 +1591,9 @@ code-point-at@^1.0.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/code-point-at/-/code-point-at-1.1.0.tgz#0d070b4d043a5bea33a2f1a40e2edb3d9a4ccf77"
 
-codemirror@5.33.0:
-  version "5.33.0"
-  resolved "https://registry.yarnpkg.com/codemirror/-/codemirror-5.33.0.tgz#462ad9a6fe8d38b541a9536a3997e1ef93b40c6a"
+codemirror@5.39.2:
+  version "5.39.2"
+  resolved "https://registry.yarnpkg.com/codemirror/-/codemirror-5.39.2.tgz#778aa13b55ebf280745c309cb1b148e3fc06f698"
 
 collection-visit@^1.0.0:
   version "1.0.0"