Bump react-intl from 2.7.2 to 2.9.0 (#10940)

Bumps [react-intl](https://github.com/yahoo/react-intl) from 2.7.2 to 2.9.0.
- [Release notes](https://github.com/yahoo/react-intl/releases)
- [Commits](https://github.com/yahoo/react-intl/compare/v2.7.2...v2.9.0)

package.json

@@ -126,7 +126,7 @@
     "react-hotkeys": "^1.1.4",
     "react-immutable-proptypes": "^2.1.0",
     "react-immutable-pure-component": "^1.1.1",
-    "react-intl": "^2.7.2",
+    "react-intl": "^2.9.0",
     "react-masonry-infinite": "^1.2.2",
     "react-motion": "^0.5.2",
     "react-notification": "^6.8.4",