chore(package): update react to version 16.8.6

Closes #17

Author: greenkeeper[bot]

package.json

@@ -12,7 +12,7 @@
     "babel-preset-es2015": "^6.22.0",
     "babel-preset-react": "^6.23.0",
     "nyc": "^11.0.1",
-    "react": "^15.4.2",
+    "react": "^16.8.6",
     "react-addons-test-utils": "^15.4.2",
     "react-dom": "^15.4.2",
     "react-test-render": "^1.0.3",