Revert "version: bump to v3.1.0-rc.0"

This reverts commit cb178a78eabe9b3753c8c1f876d76d9989321594.

version/version.go

@@ -24,7 +24,7 @@ import (
 var (
 	// MinClusterVersion is the min cluster version this etcd binary is compatible with.
 	MinClusterVersion = "3.0.0"
-	Version           = "v3.1.0-rc.0"
+	Version           = "3.1.0-alpha.1+git"
 
 	// Git SHA Value will be set during build
 	GitSHA = "Not provided (use ./build instead of go build)"