chore(package): update react to version 16.8.0

Author: greenkeeper[bot]

package.json

@@ -38,7 +38,7 @@
     "classnames": "^2.2.6",
     "node-sass": "4.11.0",
     "prop-types": "^15.6.2",
-    "react": "^16.7.0",
+    "react": "^16.8.0",
     "react-css-modules": "^4.7.4",
     "react-dom": "^16.7.0",
     "react-flag-icon-css": "^1.0.25"