chore: release 3.1.3 (#154)
chore: release 3.1.3 (#154)

:robot: I have created a release \*beep\* \*boop\*
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### [3.1.3](https://www.github.com/googleapis/nodejs-service-directory/compare/v3.1.2...v3.1.3) (2021-06-23)


### Bug Fixes

* make request optional in all cases ([#153](https://www.github.com/googleapis/nodejs-service-directory/issues/153)) ([3bc4004](https://www.github.com/googleapis/nodejs-service-directory/commit/3bc4004be93fadaf15b84c7aea31eba3450ddd8d))
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