* updated versions.txt [ci skip]

* updated appengine/pom.xml [ci skip]

* updated bom/pom.xml [ci skip]

* updated credentials/pom.xml [ci skip]

* updated oauth2_http/pom.xml [ci skip]

* updated pom.xml [ci skip]

…ent-bom to v1.34.1 (#403)

…405)

* Linkage Monitor configuration

* Updating repository name

* empty commit

…ent-bom to v1.34.2 (#407)

…-sdk to v1.9.78 (#399)

…ugin to v3.9.0 (#412)

…ncy-plugin to v3.1.2 (#413)

)

…-plugin to v3.2.0 (#423)

… to v1.35.0 (#427)

* feat: add TokenVerifier class that can verify RS256/ES256 tokens

* test: inject HttpTransportFactory for testing

* test: inject HttpTransportFactory for testing

* fix: use google-http-client for actual signature verification

* chore: lint

* test: split test into unit and integration

Unit tests mock out the http request activity. Integration tests hit the
live urls.

* chore: lint

* fix: return the JsonWebSignature instance on verify

* test: remove IT test as the signature keys can/will change over time

* docs: add javadoc for TokenVerifier

* docs: add guide for verifying tokens in the README

* chore: remove auto-value config changes

* chore: tense, lower-case first word, no period

* chore: run formatter

* chore: more javadoc fixes

* chore: remove line from README example

* sample: add snippet showing check for additional claim

* fix: remove default constructor - users should always use builder

🤖 I have created a release \*beep\* \*boop\* 
---
## [0.21.0](https://www.github.com/googleapis/google-auth-library-java/compare/v0.20.0...v0.21.0) (2020-06-24)


### Features

* add TokenVerifier class that can verify RS256/ES256 tokens ([#420](https://www.github.com/googleapis/google-auth-library-java/issues/420)) ([5014ac7](https://www.github.com/googleapis/google-auth-library-java/commit/5014ac72a59d877ef95c616d0b33792b9fc70c25))


### Dependencies

* update autovalue packages to v1.7.2 ([#429](https://www.github.com/googleapis/google-auth-library-java/issues/429)) ([5758364](https://www.github.com/googleapis/google-auth-library-java/commit/575836405bd5803d6202bd0018609184d6a15831))
* update dependency com.google.http-client:google-http-client-bom to v1.35.0 ([#427](https://www.github.com/googleapis/google-auth-library-java/issues/427)) ([5494ec0](https://www.github.com/googleapis/google-auth-library-java/commit/5494ec0a73319fb955b3d7ba025aea9607020c4e))
* update Guava to 29.0-android ([#426](https://www.github.com/googleapis/google-auth-library-java/issues/426)) ([0cd3c2e](https://www.github.com/googleapis/google-auth-library-java/commit/0cd3c2ec0aef3ff0f0379b32f9d05126442219b6))
---


This PR was generated with [Release Please](https://github.com/googleapis/release-please).