chore: release 0.3.0

[github-actions]

🤖 I have created a release *beep* *boop*

0.3.0 (2021-08-03)

Features

• support Active Directory auth for Windows (#131) (66e4e2e)

Bug Fixes

• only replace refresh result if successful or current is invalid (#135) (9c8ed67)
• strip padding from access tokens if present (#138) (1bc2ee4), closes #137

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[github-actions]

🤖 Release is at https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/releases/tag/v0.3.0 🌻