chore(package): update react-test-renderer to version 16.12.0

Closes #32

Author: greenkeeper[bot]

package.json

@@ -23,7 +23,7 @@
     "babel-jest": "^24.9.0",
     "jest": "^24.9.0",
     "react-addons-test-utils": "15.6.2",
-    "react-test-renderer": "16.9.0",
+    "react-test-renderer": "16.12.0",
     "request": "^2.88.0",
     "standard": "^14.2.0"
   },