Remove jest-coverage command

Author: wojtekmaj

package.json

@@ -11,7 +11,6 @@
     "clean": "rimraf dist",
     "copy-styles": "node ./copy-styles.js",
     "jest": "jest",
-    "jest-coverage": "jest --coverage",
     "lint": "eslint sample/ src/ test/ --ext .jsx,.js",
     "prepack": "yarn clean && yarn build",
     "test": "yarn lint && yarn jest"