chore(package): update rollup-plugin-copy to version 3.0.0

Closes #25

Author: greenkeeper[bot]

package.json

@@ -23,7 +23,7 @@
     "rollup": "^0.57.1",
     "rollup-plugin-browsersync": "^0.2.6",
     "rollup-plugin-commonjs": "^9.1.0",
-    "rollup-plugin-copy": "^0.2.3",
+    "rollup-plugin-copy": "^3.0.0",
     "rollup-plugin-json": "^2.3.0",
     "rollup-plugin-node-builtins": "^2.1.2",
     "rollup-plugin-node-globals": "^1.2.0",