chore(deps-dev): bump rc-dropdown from 2.4.1 to 3.0.1

Bumps [rc-dropdown](https://github.com/react-component/dropdown) from 2.4.1 to 3.0.1.
- [Release notes](https://github.com/react-component/dropdown/releases)
- [Changelog](https://github.com/react-component/dropdown/blob/master/HISTORY.md)
- [Commits](react-component/dropdown@2.4.1...v3.0.1)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

package.json

@@ -77,7 +77,7 @@
     "np": "^6.0.0",
     "prettier": "^1.11.1",
     "rc-animate": "^2.10.1",
-    "rc-dropdown": "~2.4.1",
+    "rc-dropdown": "~3.0.1",
     "rc-menu": "^7.4.23",
     "react": "^16.0.0",
     "react-dnd": "^2.5.4",