v0.15.0

Changelog

• 66c28ce Update CHANGELOG for 0.15.0.
• b46dff1 Use alpine:3.17 as a base Docker image.
• 9a831b2 Welcome 2023.
• da72c83 Update dependencies.
• 13a1e68 Fix build status badge.
• bfef0c4 Drop drone integration.
• 4642603 Use github actions
• 5c54447 Use Go 1.20.
• c1fdd1f Use pgbouncer 1.18.
• eaf82fa Support pgbouncer 1.18+ (#25)