Update react version to 15.5.1.

Cause latest is greatest.

Author: izaakschroeder

package.json

@@ -49,9 +49,9 @@
     "eslint-plugin-react": "^5.1.1",
     "mocha": "^3.0.2",
     "path": "^0.12.7",
-    "react": "^15.3.1",
-    "react-addons-test-utils": "^15.3.1",
-    "react-dom": "^15.3.1",
+    "react": "^15.5.1",
+    "react-addons-test-utils": "^15.5.1",
+    "react-dom": "^15.5.1",
     "sinon": "^1.17.6",
     "webpack": "^1.12.11",
     "webpack-dev-server": "^1.14.1"