fix(deps): update module github.com/jordan-wright/email to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/jordan-wright/email	require	major	v0.0.0-20200602115436-fd8a7622303e -> v4.0.0

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Configuration

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[renovate]

⚠ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you check the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: go.sum

Command failed: docker run --rm --name=renovate_go --label=renovate_child -v "/mnt/renovate/gh/axetroy/go-server":"/mnt/renovate/gh/axetroy/go-server" -v "/tmp/renovate-cache":"/tmp/renovate-cache" -e GOPATH -e GOFLAGS -e CGO_ENABLED -w "/mnt/renovate/gh/axetroy/go-server" docker.io/renovate/go:1.17.1 bash -l -c "git config --global url.\"https://**redacted**@github.com/\".insteadOf \"https://github.com/\" && go get -d ./... && go mod tidy && go mod vendor && go mod tidy && go mod tidy"
go: github.com/jordan-wright/email/[email protected]: go.mod has non-.../v4 module path "github.com/jordan-wright/email" (and .../v4/go.mod does not exist) at revision v4.0.0