chore: release 0.38.0 (#841)

Author: release-please[bot]

CHANGES.md

@@ -1,5 +1,18 @@
 # Changes
 
+## [0.38.0](https://www.github.com/googleapis/google-api-go-client/compare/v0.37.0...v0.38.0) (2021-01-29)
+
+
+### Features
+
+* **all:** auto-regenerate discovery clients , refs [#846](https://www.github.com/googleapis/google-api-go-client/issues/846) [#845](https://www.github.com/googleapis/google-api-go-client/issues/845) [#844](https://www.github.com/googleapis/google-api-go-client/issues/844) [#840](https://www.github.com/googleapis/google-api-go-client/issues/840)
+
+
+### Bug Fixes
+
+* **internal:** don't self-sign JWT when an endpoint provided ([#847](https://www.github.com/googleapis/google-api-go-client/issues/847)) ([55f262c](https://www.github.com/googleapis/google-api-go-client/commit/55f262c3a4e8d287ceeeee844b0d174299acc439))
+* **internal:** don't use self-signed JWT with impersonation ([#788](https://www.github.com/googleapis/google-api-go-client/issues/788)) ([1dc7dac](https://www.github.com/googleapis/google-api-go-client/commit/1dc7dacd54b4b93f5465b71f2ee8c27e59630454))
+
 ## [0.37.0](https://www.github.com/googleapis/google-api-go-client/compare/v0.36.0...v0.37.0) (2021-01-25)