chore(package): update rollup-plugin-node-resolve to version 5.1.0

Closes #7

Author: greenkeeper[bot]

package.json

@@ -40,7 +40,7 @@
     "rollup": "^0.63.0",
     "rollup-plugin-babel": "^3.0.4",
     "rollup-plugin-commonjs": "^9.1.3",
-    "rollup-plugin-node-resolve": "^3.3.0"
+    "rollup-plugin-node-resolve": "^5.1.0"
   },
   "dependencies": {
     "purgecss": "^1.0.0",