chore(package): update rollup-plugin-alias to version 1.5.1

Author: greenkeeper[bot]

package.json

@@ -102,7 +102,7 @@
     "istanbul": "^0.4.5",
     "npm-dollar": "^2.1.2",
     "rollup": "^0.67.3",
-    "rollup-plugin-alias": "^1.4.0",
+    "rollup-plugin-alias": "^1.5.1",
     "rollup-plugin-babel": "^4.0.3",
     "rollup-plugin-cdn": "^0.1.2",
     "rollup-plugin-node-resolve": "^4.0.0",