Greenkeeper/jest 20.0.0 (#28)

* chore(package): update jest to version 20.0.0

* updated also babel-jest and generated yarn.lock

Author: chrishelgert

package.json

@@ -38,13 +38,13 @@
     "babel-cli": "^6.18.0",
     "babel-core": "^6.21.0",
     "babel-eslint": "^7.1.1",
-    "babel-jest": "^18.0.0",
+    "babel-jest": "^20.0.0",
     "babel-loader": "^7.0.0",
     "babel-plugin-transform-object-rest-spread": "^6.20.2",
     "babel-preset-es2015": "^6.18.0",
     "babel-preset-react": "^6.16.0",
     "cross-env": "^4.0.0",
-    "jest": "^19.0.1",
+    "jest": "^20.0.0",
     "react": "^15.4.1",
     "react-test-renderer": "^15.4.1",
     "rimraf": "^2.5.4",