chore(package): update react-test-renderer to version 16.4.2

Closes #76

Author: greenkeeper[bot]

package.json

@@ -127,7 +127,7 @@
     "electron": "1.8.3",
     "electron-builder": "^20.2.0",
     "jest": "22.3.0",
-    "react-test-renderer": "16.2.0"
+    "react-test-renderer": "16.4.2"
   },
   "jest": {
     "preset": "react-native",