rpc: protocol version (#575)

* evm: protocol version

* changelog

* version

* fix

* support latest version only

version/version.go

@@ -1,26 +0,0 @@
-package version
-
-import (
-	"fmt"
-	"runtime"
-)
-
-// AppName represents the application name as the 'user agent' on the larger Ethereum network.
-const AppName = "Ethermint"
-
-// Version contains the application semantic version.
-//
-// TODO: How do we want to version this being that an initial Ethermint has
-// been developed?
-const Version = "0.0.0"
-
-// ProtocolVersion is the supported Ethereum protocol version (e.g., Homestead, Olympic, etc.)
-const ProtocolVersion = 63
-
-// GitCommit contains the git SHA1 short hash set by build flags.
-var GitCommit = ""
-
-// ClientVersion returns the full version string for identification on the larger Ethereum network.
-func ClientVersion() string {
-	return fmt.Sprintf("%s/%s+%s/%s/%s", AppName, Version, GitCommit, runtime.GOOS, runtime.Version())
-}