Downgrade to google.golang.org/protobuf@v1.23.0

What's Changed

• remove glide from docs by @jcapote-lyft in #116
• makefile cleanup by @jcapote-lyft in #117
• Downgrade google.golang.org/protobuf to v1.23.0 by @pdecks in #120

New Contributors

• @jcapote-lyft made their first contribution in #116

Full Changelog: v2.0.1...v2.0.3