v0.21.1

What's Changed

• feat(apisix-standalone): support upstream healthcheck and service discovery by @bzp2010 in #333
• fix(apisix-standalone): duplicate upstreams when use service multiple upstreams by @bzp2010 in #334
• fix(backend-api7): duplicate removal of upstream and credentials by @bzp2010 in #343
• fix(apisix-standalone): conflict between upstream nodes and service discovery by @bzp2010 in #344
• feat: bump to 0.21.1 by @bzp2010 in #345

Full Changelog: v0.21.0...v0.21.1