v1.15.0

chore: release 1.15.0 (#510)

* updated CHANGELOG.md [ci skip]

* updated setup.cfg [ci skip]

* updated setup.py [ci skip]

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

v1.14.3

chore: release 1.14.3 (#509)

* updated CHANGELOG.md [ci skip]

* updated setup.cfg [ci skip]

* updated setup.py [ci skip]

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

v1.14.2

chore: release 1.14.2 (#505)

:robot: I have created a release \*beep\* \*boop\* 
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### [1.14.2](https://www.github.com/googleapis/google-auth-library-python/compare/v1.14.1...v1.14.2) (2020-05-07)


### Bug Fixes

* support string type response.data ([#504](https://www.github.com/googleapis/google-auth-library-python/issues/504)) ([9b7228e](https://www.github.com/googleapis/google-auth-library-python/commit/9b7228ec849e311bcb4007ad3e23cf2f1e54a721))
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This PR was generated with [Release Please](https://github.com/googleapis/release-please).

v1.14.1

Bug Fixes

• support es256 raw format signature (#490) (cf2c0a9)

v1.14.0

chore: release 1.14.0 (#487)

* updated CHANGELOG.md [ci skip]

* updated setup.cfg [ci skip]

* updated setup.py [ci skip]

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

v1.13.1

chore: release 1.13.1 (#482)

v1.13.0

chore: release 1.13.0 (#477)

v1.12.0

Features

• add mTLS ADC support for HTTP (#457) (bb9215a)
• add SslCredentials class for mTLS ADC (#448) (dafb41f)
• fetch id token from GCE metadata server (#462) (97e7700)

Bug Fixes

• don't use threads for gRPC AuthMetadataPlugin (#467) (ee373f8)
• make ThreadPoolExecutor a class var (#461) (b526473)

v1.11.3

Bug Fixes

• fix the scopes so test can pass for a local run (#450) (b2dd77f)
• only add IAM scope to credentials that can change scopes (#451) (82e224b)

v1.11.2

Reverts

• Revert "fix: update _GOOGLE_OAUTH2_CERTS_URL (#365)" (#444) (901c259), closes #365 #444

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