Bump github.com/pires/go-proxyproto from 0.1.3 to 0.2.0 (#265)

Bumps [github.com/pires/go-proxyproto](https://github.com/pires/go-proxyproto) from 0.1.3 to 0.2.0.
- [Release notes](https://github.com/pires/go-proxyproto/releases)
- [Commits](https://github.com/pires/go-proxyproto/compare/v0.1.3...v0.2.0)

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