goodbye json5

we will error handle json during load after https://github.com/pattern-lab/patternlab-node/pull/634 solidifies
part of #637

Author: bmuenzenmeyer

package.json

@@ -10,7 +10,6 @@
     "glob": "^7.0.0",
     "js-beautify": "^1.6.3",
     "js-yaml": "^3.6.1",
-    "json5": "^0.5.0",
     "lodash": "~4.13.1",
     "markdown-it": "^6.0.1",
     "node-fetch": "^1.6.0",