chore: release 2.2.0

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2.2.0 (2021-06-30)

Features

• add from_service_account_info (095747e)
• add always_use_jwt_access (#112) (01c8095)

Bug Fixes

• deps: add packaging requirement (#99) (c00ab57)
• disable always_use_jwt_access (a422ac0)
• disable always_use_jwt_access (#115) (a422ac0)
• fix retry deadlines (#73) (095747e)

Documentation

• omit mention of Python 2.7 in 'CONTRIBUTING.rst' (#1127) (#109) (fe89307), closes #1126

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Release is at https://github.com/googleapis/python-talent/releases/tag/v2.2.0

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