delete unused 04-channel version functions (cosmos#1636)

* delete unused code and associated tests * Update CHANGELOG.md
dudong2 · Jul 1, 2022 · 6c4a442 · 6c4a442
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -51,6 +51,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (apps/27-interchain-accounts)[\#1565](https://github.com/cosmos/ibc-go/pull/1565) Removing `NewErrorAcknowledgement` in favour of `channeltypes.NewErrorAcknowledgement`.
 * (transfer)[\#1565](https://github.com/cosmos/ibc-go/pull/1565) Removing `NewErrorAcknowledgement` in favour of `channeltypes.NewErrorAcknowledgement`.
 * (channel)[\#1565](https://github.com/cosmos/ibc-go/pull/1565) Updating `NewErrorAcknowledgement` to accept an error instead of a string and removing the possibility of non-deterministic writes to application state.
+* (core/04-channel)[\#1636](https://github.com/cosmos/ibc-go/pull/1636) Removing `SplitChannelVersion` and `MergeChannelVersions` functions since they are not used.
 
 ### State Machine Breaking
 

diff --git a/modules/core/04-channel/types/version.go b/modules/core/04-channel/types/version.go
diff --git a/modules/core/04-channel/types/version_test.go b/modules/core/04-channel/types/version_test.go