Update coveralls

Author: leebyron

package.json

@@ -65,7 +65,7 @@
     "chai": "3.5.0",
     "chai-json-equal": "0.0.1",
     "chai-subset": "1.3.0",
-    "coveralls": "2.11.14",
+    "coveralls": "2.11.15",
     "eslint": "3.10.0",
     "eslint-plugin-babel": "3.3.0",
     "eslint-plugin-flowtype": "2.25.0",