Bump codemirror from 5.34.0 to 5.58.2

Bumps [codemirror](https://github.com/codemirror/CodeMirror) from 5.34.0 to 5.58.2.
- [Release notes](https://github.com/codemirror/CodeMirror/releases)
- [Changelog](https://github.com/codemirror/CodeMirror/blob/master/CHANGELOG.md)
- [Commits](codemirror/codemirror5@5.34.0...5.58.2)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package-lock.json

@@ -34,7 +34,7 @@
     "@types/react-router": "2.0.38",
     "babel-polyfill": "^6.9.1",
     "byots": "^2.1.0-dev.20161101.22.10",
-    "codemirror": "^5.20.2",
+    "codemirror": "^5.58.2",
     "css-to-typestyle": "^0.0.9",
     "csstips": "^0.2.2",
     "csx": "^8.5.0",