chore(readme): Updated emoji key link in Readme.md 🧐 (#289)

Just a minor correction of the anchor link in Readme file.

README.md

@@ -80,7 +80,7 @@ Simply install React Native WebView and then use it in place of the core WebView
 
 ## Contributors
 
-Thanks goes to these wonderful people ([emoji key](https://github.com/all-contributors/all-contributors#emoji-key)):
+Thanks goes to these wonderful people ([emoji key](https://github.com/all-contributors/all-contributors#emoji-key-)):
 
 <!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
 <!-- prettier-ignore -->