chore(release): 9.4.0 [skip ci]

# [9.4.0](https://github.com/react-native-community/react-native-webview/compare/v9.3.0...v9.4.0) (2020-04-29)

### Features

* **iOS:** Add onFileDownload callback ([#1214](https://github.com/react-native-community/react-native-webview/issues/1214)) ([a6010d9](https://github.com/react-native-community/react-native-webview/commit/a6010d9))

package.json

@@ -8,7 +8,7 @@
     "Thibault Malbranche <malbranche.thibault@gmail.com>"
   ],
   "license": "MIT",
-  "version": "9.3.0",
+  "version": "9.4.0",
   "homepage": "https://github.com/react-native-community/react-native-webview#readme",
   "scripts": {
     "start": "node node_modules/react-native/local-cli/cli.js start",