Update to Go 1.20

Changelog for 0.13.0:

Commits
1d2e443 Ignore gofmt errors from vendor folder by @alexellis
2a30804 Remove usage of deprecated errors package by @alexellis
35232db Remove rebuild and cgo by @alexellis
bb1e670 Update to Go 1.20 by @alexellis

Changes: 0.12.15...0.13.0

Generated by Derek