dep

package.json

@@ -40,6 +40,7 @@
     "babel-plugin-transform-regenerator": "^6.16.1",
     "babelify": "^7.3.0",
     "browserify": "^13.0.1",
+    "ethereum-common": "0.0.18",
     "ethereumjs-util": "^4.5.0",
     "fast-async": "^6.1.2",
     "http-server": "^0.9.0",