chore(package): update react to version 16.12.0

Closes #69

Author: greenkeeper[bot]

package.json

@@ -70,7 +70,7 @@
     "jsdom": "^11.1.0",
     "nyc": "^11.0.3",
     "prop-types": "^15.5.10",
-    "react": "^15.6.1",
+    "react": "^16.12.0",
     "rimraf": "^2.5.4",
     "validate-commit-msg": "^2.12.2"
   },