Update changelogs

[jportner]

Resolves #167 :

1. Adds a top-level changelog that points to individual package changelogs
2. Updates several package changelogs to mention breaking changes

Rendered markdown: https://github.com/jportner/proxy-agents/blob/update-changelogs/CHANGELOG.md

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⚠️ No Changeset found

Latest commit: 0f4d1d8aa77079e0de912094f0b54555433d24b2

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Name	Status	Preview	Updated (UTC)
proxy-agents	✅ Ready (Inspect)	Visit Preview	May 18, 2023 4:50pm

[TooTallNate]

Thank you for writing this up! Very helpful