fix(location): the version of istanbul

Author: lulutia

package.json

@@ -37,7 +37,7 @@
     "eslint": "^2.10.2",
     "eslint-plugin-react": "^5.1.1",
     "ghooks": "^1.2.1",
-    "istanbul": "^0.4.3",
+    "istanbul": "^1.0.0-alpha.2",
     "jsdom": "^9.2.1",
     "mocha": "^2.5.3",
     "react": "15.0.2",