Merge pull request #5 from timoa/dependabot/npm_and_yarn/acorn-6.4.1

Bump acorn from 6.1.0 to 6.4.1

Author: timoa

package-lock.json

@@ -53,7 +53,7 @@
     "darwin"
   ],
   "devDependencies": {
-    "acorn": "^6.0.4",
+    "acorn": "^6.4.1",
     "acorn-jsx": "^5.0.0",
     "chai": "^4.2.0",
     "eslint": "^5.9.0",