Adds a new npm script: check-cover, which reports the coverage of type checked code.

Author: leebyron

package.json

@@ -39,6 +39,7 @@
     "t": "babel-node ./node_modules/.bin/_mocha --require ./resources/mocha-bootload",
     "lint": "eslint src",
     "check": "flow check",
+    "check-cover": "for file in {src/*.js,src/**/*.js}; do echo $file; flow coverage $file; done",
     "build": "babel src --ignore __tests__ --out-dir dist/ && cp package.json dist/",
     "watch": "babel-node ./resources/watch.js",
     "cover": "babel-node ./node_modules/.bin/isparta cover --root src --report html _mocha -- $npm_package_options_mocha",