chore(package): update jest-cli to version 21.0.0 (#28)

Author: greenkeeper[bot]

package.json

@@ -73,7 +73,7 @@
     "coveralls": "^2.12.0",
     "jest": "^20.0.1",
     "jsdoc-to-markdown": "^3.0.0",
-    "jest-cli": "^20.0.0",
+    "jest-cli": "^21.0.0",
     "rollup": "^0.48.0",
     "rollup-plugin-babel": "^2.7.1",
     "semantic-release": "^7.0.1",