revert upgrade of ibc-go

Author: timlind

go.mod

@@ -7,7 +7,7 @@ require (
 	github.com/MakeNowJust/heredoc v1.0.0
 	github.com/cespare/cp v1.1.1 // indirect
 	github.com/cosmos/cosmos-sdk v0.45.9
-	github.com/cosmos/ibc-go/v2 v2.4.1
+	github.com/cosmos/ibc-go/v2 v2.0.2
 	github.com/deckarep/golang-set v1.7.1 // indirect
 	github.com/ethereum/go-ethereum v1.10.13
 	github.com/gballet/go-libpcsclite v0.0.0-20191108122812-4678299bea08 // indirect
@@ -158,6 +158,7 @@ require pgregory.net/rapid v0.4.7
 
 replace (
 	github.com/confio/ics23/go => github.com/cosmos/cosmos-sdk/ics23/go v0.8.0
+	github.com/cosmos/ibc-go/v2 => github.com/Sifchain/ibc-go/v2 v2.0.3-issue.850
 	github.com/gogo/protobuf => github.com/regen-network/protobuf v1.3.3-alpha.regen.1
 	github.com/libp2p/go-buffer-pool => github.com/libp2p/go-buffer-pool v0.1.0
 	google.golang.org/grpc => google.golang.org/grpc v1.33.2