fix(package): update react-google-maps to version 9.2.2

Closes #16

Author: greenkeeper[bot]

package.json

@@ -26,7 +26,7 @@
     "react-dom": "^15.6.1",
     "react-fontawesome": "^1.5.0",
     "react-ga": "^2.1.2",
-    "react-google-maps": "^8.0.0",
+    "react-google-maps": "^9.2.2",
     "react-highcharts": "^12.0.0",
     "react-json-tree": "^0.10.9",
     "react-syntax-highlighter": "^5.6.2"