chore: add script for generating changelog

[Jefiozie]

With this change, we generate a CHANGELOG everytime we deploy.

[Jefiozie]

@manekinekko, I'm not sure if this is the correct change but I think this should be enough to start with a changelog on every deploy.

[nx-cloud]

Nx Cloud Report

CI ran the following commands for commit 44cee5d. Click to see the status, the terminal output, and the build insights.

Status	Command	Start Time
	nx affected:build --base=origin/main --head=HEAD --parallel --with-deps	10/21/2020, 8:02:44 PM
	nx affected:e2e --base=origin/main --head=HEAD --parallel --with-deps	10/21/2020, 7:56:27 PM
	nx affected:lint --base=origin/main --head=HEAD --parallel	10/21/2020, 7:57:07 PM
	nx affected:test --base=origin/main --head=HEAD --parallel --with-deps	10/21/2020, 7:56:35 PM

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[Jefiozie]

I'm merging it in so that people can see our changelog. If we need changes we can make this in a separate PR