chore(package): update react-test-renderer to version 16.8.2

Closes #298

Author: greenkeeper[bot]

package.json

@@ -59,7 +59,7 @@
     "react": "^16.8.2",
     "react-dom": "^16.8.2",
     "react-router": "^3.0.4",
-    "react-test-renderer": "^15.6.1",
+    "react-test-renderer": "^16.8.2",
     "sinon": "2.3.8",
     "webpack": "3.3.0",
     "webpack-dev-server": "2.6.1"