Contributing guidelines are stale

[jsoref]

Operating System

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Browser Version

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Firebase SDK Version

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Firebase SDK Product:

Installations

Describe your project's tooling

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Describe the problem

The contributing guidelines listed for this project are stale

Steps and code to reproduce issue

1. Try to open a PR
2. Be told to read CONTRIBUTING.md
3. Read it...

4. firebase-js-sdk/CONTRIBUTING.md

   Line 9 in 5e16ccf

   - [Feature Requests](#feature)

   references #feature which is conceptually HTTP 404

5. firebase-js-sdk/CONTRIBUTING.md

   Line 19 in 5e16ccf

   Communication through any of Firebase's channels (GitHub, StackOverflow, Google+, Twitter, etc.)

   references Google+ which is conceptually HTTP 410

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