chore(deps): update dependency markdownlint-cli to v0.39.0

Author: renovate[bot]

package.json

@@ -9,7 +9,7 @@
   "devDependencies": {
     "danger": "4.0.1",
     "eclint": "2.8.0",
-    "markdownlint-cli": "0.13.0",
+    "markdownlint-cli": "0.39.0",
     "prettier": "1.11.1",
     "prettier-check": "2.0.0",
     "xo": "0.20.3"