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Adding Changelog URL to the README.md file (#20915)

* Adding Changelog URL to the README.md file

* Update README to match the latest version on DEV

- Update README to match the latest version on DEV branch 
- Add Changelog URL

* Update README.md

Fix contributing link
A
Ahmed Abu Eldahab committed
89c5ace1170c225182dde72182ac0c725be6aee6
Parent: 2ea1d81
Committed by Dan Field <dfield@gmail.com> on 10/4/2018, 4:26:06 PM