add godoc and changelog entry

CHANGELOG.md

@@ -78,6 +78,8 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Bug Fixes
 
+* (testing) [\#884](https://github.com/cosmos/ibc-go/pull/884) Add and use in simapp a custom ante handler that rejects redundant transactions
+
 ## [v2.0.2](https://github.com/cosmos/ibc-go/releases/tag/v2.0.2) - 2021-12-15
 
 ### Dependencies

testing/simapp/ante_handler.go

@@ -17,6 +17,7 @@ type HandlerOptions struct {
 	IBCChannelkeeper channelkeeper.Keeper
 }
 
+// NewAnteHandler creates a new ante handler
 func NewAnteHandler(options HandlerOptions) (sdk.AnteHandler, error) {
 	if options.AccountKeeper == nil {
 		return nil, sdkerrors.Wrap(sdkerrors.ErrLogic, "account keeper is required for AnteHandler")