Remove coveralls and upgrade istanbul to alpha

package.json

@@ -46,12 +46,11 @@
     "babel-preset-es2015": "^6.6.0",
     "babel-register": "^6.7.2",
     "contributor": "^0.1.25",
-    "coveralls": "^2.11.8",
     "eslint": "^2.11.1",
     "eslint-config-airbnb": "^6.1.0",
     "eslint-plugin-mocha": "^2.0.0",
     "is": "^3.1.0",
-    "istanbul": "^0.4.2",
+    "istanbul": "^1.1.0-alpha.1",
     "jsdoc-to-markdown": "^1.3.3",
     "mocha": "^2.4.5",
     "mocha-lcov-reporter": "^1.2.0"