Adding changelog link to docs
Linking to the changelog is helpful. This is a copy of what was done on AAD and AzureRM pages.
@@ -11,6 +11,8 @@ The Azure DevOps provider can be used to configure Azure DevOps project in [Micr
Use the navigation to the left to read about the available resources.
+Interested in the provider's latest features, or want to make sure you're up to date? Check out the [changelog](https://github.com/microsoft/terraform-provider-azuredevops/blob/master/CHANGELOG.md) for version information and release notes.
+
## Example Usage
```hcl
