[fix] - add babel-jest to support development in node v4

Author: beefancohen

package.json

@@ -29,6 +29,8 @@
     "babel-cli": "^6.14.0",
     "babel-core": "^6.14.0",
     "babel-eslint": "^7.0.0",
+    "babel-jest": "^16.0.0",
+    "babel-polyfill": "^6.16.0",
     "babel-preset-es2015": "^6.14.0",
     "coveralls": "^2.11.8",
     "eslint": "^3.0.0",
@@ -50,7 +52,9 @@
     "eslint": "^2.10.2 || 3.x"
   },
   "jest": {
-    "coverageReporters": ["lcov"],
+    "coverageReporters": [
+      "lcov"
+    ],
     "coverageDirectory": "reports"
   }
 }

yarn.lock

@@ -331,7 +331,7 @@ babel-helpers@^6.16.0:
     babel-runtime "^6.0.0"
     babel-template "^6.16.0"
 
-babel-jest@^16.0.0:
+babel-jest, babel-jest@^16.0.0:
   version "16.0.0"
   resolved "https://registry.yarnpkg.com/babel-jest/-/babel-jest-16.0.0.tgz#348729aea6d624a4774b8a934d07a40dd2cfd640"
   dependencies:
@@ -548,7 +548,7 @@ babel-plugin-transform-strict-mode@^6.8.0:
     babel-runtime "^6.0.0"
     babel-types "^6.8.0"
 
-babel-polyfill@^6.16.0:
+babel-polyfill, babel-polyfill@^6.16.0:
   version "6.16.0"
   resolved "https://registry.yarnpkg.com/babel-polyfill/-/babel-polyfill-6.16.0.tgz#2d45021df87e26a374b6d4d1a9c65964d17f2422"
   dependencies: