Update README.md

[deisterhold]

Remove duplicate link.

Hey there! So you want to contribute to FirebaseUI? Before you file this pull request, follow these steps:

• Read the contribution guidelines.
• If this has been discussed in an issue, make sure to mention the issue number here. If not, go file an issue about this to make sure this is a desirable change.
• If this is a new feature please co-ordinate with someone on FirebaseUI-Android to make sure that we can implement this on both platforms and maintain feature parity.

[morganchen12]

Closing in favor of #595--let me know if this should be reopened.