update jest to 21.1.0

Author: aisensiy

packages/react-scripts/package.json

@@ -44,7 +44,7 @@
  "file-loader": "1.1.5",
  "fs-extra": "3.0.1",
  "html-webpack-plugin": "2.29.0",
- "jest": "21.0.2",
+ "jest": "21.1.0",
  "object-assign": "4.1.1",
  "postcss-flexbugs-fixes": "3.2.0",
  "postcss-loader": "2.0.8",