upgrade core-js from 0.3.3 to 0.40 and regenerator from 0.8.2 to 0.8.3

package.json

@@ -43,7 +43,7 @@
     "ast-types": "~0.6.1",
     "chokidar": "0.11.1",
     "commander": "2.5.0",
-    "core-js": "^0.3.3",
+    "core-js": "^0.4.0",
     "estraverse": "1.8.0",
     "esutils": "1.1.6",
     "fs-readdir-recursive": "0.1.0",
@@ -51,7 +51,7 @@
     "lodash": "2.4.1",
     "mkdirp": "0.5.0",
     "private": "0.1.6",
-    "regenerator": "^0.8.2",
+    "regenerator": "^0.8.3",
     "regexpu": "0.3.0",
     "roadrunner": "^1.0.4",
     "source-map": "0.1.40",