Update e2e go.mod (#2022)

Fix: compiling error.
replace IBC module to the local, which is convenient for development



## Description



closes: #XXXX

---

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- [ ] Targeted PR against correct branch (see [CONTRIBUTING.md](https://github.com/cosmos/ibc-go/blob/master/CONTRIBUTING.md#pr-targeting))
- [ ] Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
- [ ] Code follows the [module structure standards](https://github.com/cosmos/cosmos-sdk/blob/master/docs/building-modules/structure.md).
- [ ] Wrote unit and integration [tests](https://github.com/cosmos/ibc-go/blob/master/CONTRIBUTING.md#testing)
- [ ] Updated relevant documentation (`docs/`) or specification (`x/<module>/spec/`)
- [ ] Added relevant `godoc` [comments](https://blog.golang.org/godoc-documenting-go-code).
- [ ] Added a relevant changelog entry to the `Unreleased` section in `CHANGELOG.md`
- [ ] Re-reviewed `Files changed` in the Github PR explorer
- [ ] Review `Codecov Report` in the comment section below once CI passes

e2e/go.mod

@@ -170,4 +170,9 @@ require (
 )
 
 // TODO: using version v1.0.0 causes a build failure. This is the previous version which compiles successfully.
-replace github.com/ChainSafe/go-schnorrkel => github.com/ChainSafe/go-schnorrkel v0.0.0-20200405005733-88cbf1b4c40d
+replace (
+	github.com/ChainSafe/go-schnorrkel => github.com/ChainSafe/go-schnorrkel v0.0.0-20200405005733-88cbf1b4c40d
+	github.com/ChainSafe/go-schnorrkel/1 => github.com/ChainSafe/go-schnorrkel v1.0.0
+	// uncomment to use the local version of ibc-go, you will need to run `go mod tidy` in e2e directory.
+	// replace github.com/cosmos/ibc-go/v5 => ../`
+)