fix(package): update highlight.js to version 9.11.0

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -9,7 +9,7 @@
   "license": "MIT",
   "dependencies": {
     "handlebars": "4.0.6",
-    "highlight.js": "9.10.0",
+    "highlight.js": "9.11.0",
     "markdown-it": "8.3.1"
   },
   "devDependencies": {