chore(package): update react to version 16.5.2

Closes #6

Author: greenkeeper[bot]

package.json

@@ -29,7 +29,7 @@
     "codeclimate-test-reporter": "^0.5.0",
     "jest": "^21.0.0",
     "koa": "^2.3.0",
-    "react": "^15.6.1",
+    "react": "^16.5.2",
     "react-dom": "^15.6.1",
     "webpack": "^3.5.4"
   },