Update React/ReactDOM for Material UI bug

client/package.json

@@ -90,9 +90,9 @@
     "npm": "^6.4.1",
     "optimize-css-assets-webpack-plugin": "^5.0.1",
     "prop-types": "^15.6.2",
-    "react": "^16.5.2",
+    "react": "^16.6.1",
     "react-apollo": "^2.2.4",
-    "react-dom": "^16.5.2",
+    "react-dom": "^16.6.1",
     "react-redux": "^5.1.0",
     "react-router-dom": "^4.3.1",
     "redux": "^4.0.1",