v6.1.0

📚 PR:

• Bump fastify-plugin from 2.3.4 to 3.0.0
• Bump standard from 14.3.4 to 15.0.0
• Bump snazzy from 8.0.0 to 9.0.0
• Bump standard from 15.0.1 to 16.0.1
• feat: add stale (#38)
• chore: add dependabot automerge (#43)
• Fix use of ioredis on example. (#45)
• Doc fixes (#47)
• adds test to PR #34 - next callback should use the response payload (#49)