update-client should expect 2 args (#500)

Co-authored-by: colin axnér <25233464+colin-axner@users.noreply.github.com>

CHANGELOG.md

@@ -58,6 +58,10 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * [\#384](https://github.com/cosmos/ibc-go/pull/384) Added `NegotiateAppVersion` method to `IBCModule` interface supported by a gRPC query service in `05-port`. This provides routing of requests to the desired application module callback, which in turn performs application version negotiation.
 * [\#432](https://github.com/cosmos/ibc-go/pull/432) Introduce `MockIBCApp` struct to the mock module. Allows the mock module to be reused to perform custom logic on each IBC App interface function. This might be useful when testing out IBC applications written as middleware. 
 
+### Bug Fixes
+
+* (02-client) [\#500](https://github.com/cosmos/ibc-go/pull/500) Fix IBC `update-client proposal` cli command to expect correct number of args.
+
 ## [v1.2.2](https://github.com/cosmos/ibc-go/releases/tag/v1.2.2) - 2021-10-15
 
 ### Dependencies

modules/core/02-client/client/cli/tx.go

@@ -237,8 +237,8 @@ func NewUpgradeClientCmd() *cobra.Command {
 // NewCmdSubmitUpdateClientProposal implements a command handler for submitting an update IBC client proposal transaction.
 func NewCmdSubmitUpdateClientProposal() *cobra.Command {
 	cmd := &cobra.Command{
-		Use:   "update-client [subject-client-id] [substitute-client-id] [flags]",
-		Args:  cobra.ExactArgs(3),
+		Use:   "update-client [subject-client-id] [substitute-client-id]",
+		Args:  cobra.ExactArgs(2),
 		Short: "Submit an update IBC client proposal",
 		Long: "Submit an update IBC client proposal along with an initial deposit.\n" +
 			"Please specify a subject client identifier you want to update..\n" +