chore(package): update stylelint to version 13.1.0

Closes #324

Author: greenkeeper[bot]

package.json

@@ -62,7 +62,7 @@
     "proxyquire": "^2.1.0",
     "sinon": "^7.2.2",
     "strip-ansi": "^5.0.0",
-    "stylelint": "^9.9.0",
+    "stylelint": "^13.1.0",
     "stylelint-config-standard": "^18.2.0",
     "tslint": "^5.12.0",
     "typescript": "^3.2.2",