fix(package): update handlebars to version 4.0.10

Closes #16

Author: greenkeeper[bot]

package.json

@@ -8,7 +8,7 @@
   },
   "license": "MIT",
   "dependencies": {
-    "handlebars": "4.0.8",
+    "handlebars": "4.0.10",
     "highlight.js": "9.11.0",
     "markdown-it": "8.3.1"
   },