Update README to point to the consolidated Changelog file (#1305)

Updates the repo's README to point directly towards the CHANGELOG.md for release notes given the number of artifacts.

Author: TopherGopher

README.md

@@ -7,7 +7,7 @@
 
 The v2 SDK requires a minimum version of `Go 1.15`.
 
-Checkout out the [release notes](https://github.com/aws/aws-sdk-go-v2/releases) for information about the latest bug
+Checkout out the [release notes](https://github.com/aws/aws-sdk-go-v2/blob/main/CHANGELOG.md) for information about the latest bug
 fixes, updates, and features added to the SDK.
 
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