chore(package): update replace-in-file to version 6.0.0

Closes #58

Author: greenkeeper[bot]

package.json

@@ -119,7 +119,7 @@
     "react": "^16.2.0",
     "react-codemirror": "^1.0.0",
     "react-dom": "^16.3.2",
-    "replace-in-file": "^3.4.0",
+    "replace-in-file": "^6.0.0",
     "rimraf": "^2.6.1",
     "rollup": "^0.59.0",
     "rollup-plugin-alias": "^1.4.0",