Bump go.uber.org/atomic from 1.6.0 to 1.7.0

Bumps [go.uber.org/atomic](https://github.com/uber-go/atomic) from 1.6.0 to 1.7.0.
- [Release notes](https://github.com/uber-go/atomic/releases)
- [Changelog](https://github.com/uber-go/atomic/blob/master/CHANGELOG.md)
- [Commits](https://github.com/uber-go/atomic/compare/v1.6.0...v1.7.0

)

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