v3.3.0-rc.0-grpc1.30.0

Fork of master branch:

• removed google.golang.org/grpc/naming dependency
• removed implementation of a cluster for clientv3/proxy/grpcproxy package
• updated implementation of clientv3/balancer to satisfy latest interfaces in google.golang.org/grpc/balancer package
• bumped gprc-go to 1.30.0 version
• removed vendor directory

v3.3.20-grpc1.27.1

This is etcd v3.3.20 that builds w/ grpc v1.27.0 and higher.
Use this version if you're changing imports in the code; use v3.3.20-grpc1.27-origmodule if you just want to slap a replace to your go.mod.

v3.3.20-grpc1.27-origmodule

This is v3.3.20 which compiles w/ grpc >= v1.27.0 and has an original module name.
Use this release like this:

replace github.com/coreos/etcd => github.com/ozonru/etcd v3.3.20-grpc1.27-origmodule+incompatible