build: upgrade deps

package.json

@@ -34,13 +34,12 @@
     "@babel/polyfill": "^7.0.0",
     "@babel/runtime": "^7.1.5",
     "chart.js": "^2.7.3",
-    "chat.js": "^1.0.2",
     "classnames": "^2.2.6",
     "history": "^4.7.2",
     "memoize-one": "^4.0.3",
     "modern-normalize": "^0.5.0",
     "prop-types": "^15.5.10",
-    "react": "16.7.0-alpha.0",
+    "react": "^16.7.0-alpha.2",
     "react-cache": "2.0.0-alpha.1",
     "react-dom": "^16.7.0-alpha.0",
     "react-modal": "^3.6.1",