fix build

package.json

@@ -18,10 +18,8 @@
   },
   "devDependencies": {
     "babel-eslint": "^7.1.1",
-    "babel-plugin-transform-object-assign": "^6.22.0",
-    "babel-plugin-yo-yoify": "^0.3.3",
-    "babel-polyfill": "^6.22.0",
     "babel-preset-es2015": "^6.24.0",
+    "babel-plugin-transform-object-assign": "^6.22.0",
     "babelify": "^7.3.0",
     "browserify": "^13.0.1",
     "ethereum-common": "0.0.18",
@@ -83,58 +81,23 @@
     ],
     "parser": "babel-eslint"
   },
-  "babel": {
-    "plugins": [
-      "transform-es2015-template-literals",
-      "transform-es2015-literals",
-      "transform-es2015-function-name",
-      "transform-es2015-arrow-functions",
-      "transform-es2015-block-scoped-functions",
-      "transform-es2015-classes",
-      "transform-es2015-object-super",
-      "transform-es2015-shorthand-properties",
-      "transform-es2015-duplicate-keys",
-      "transform-es2015-computed-properties",
-      "transform-es2015-for-of",
-      "transform-es2015-sticky-regex",
-      "transform-es2015-unicode-regex",
-      "check-es2015-constants",
-      "transform-es2015-spread",
-      "transform-es2015-parameters",
-      "transform-es2015-destructuring",
-      "transform-es2015-block-scoping",
-      "transform-object-assign"
-    ]
-  },
   "browserify": {
     "transform": [
-      [
-        "babelify",
-        {
-          "sourceMapsAbsolute": false,
-          "sourceMaps": true,
+      ["babelify", {
         "plugins": [
-            [
-              "fast-async",
-              {
-                "runtimePattern": null,
+          ["fast-async", {
+            "runtimePatten": null,
             "compiler": {
+              "promises": true,
               "es7": true,
               "noRuntime": true,
-                  "promises": true,
               "wrapAwait": true
             }
-              }
-            ],
-            [
-              "yo-yoify"
-            ]
-          ],
-          "presets": [
-            "es2015"
-          ]
-        }
+          }], "transform-object-assign"
         ]
+      }],
+      ["yo-yoify"],
+      ["babelify", { "presets": ["es2015"] }]
     ]
   }
 }