chore(package): update rollup-plugin-node-resolve to version 4.2.1

Closes #26

Author: greenkeeper[bot]

package.json

@@ -109,7 +109,7 @@
     "rollup": "^0.55.0",
     "rollup-plugin-commonjs": "^8.0.2",
     "rollup-plugin-copy": "^0.2.3",
-    "rollup-plugin-node-resolve": "^3.0.0",
+    "rollup-plugin-node-resolve": "^4.2.1",
     "rollup-plugin-sourcemaps": "^0.4.2",
     "rollup-plugin-typescript2": "^0.10.0",
     "semantic-release": "^12.2.4",