Bump github.com/xanzy/go-gitlab from 0.32.1 to 0.39.0

Bumps [github.com/xanzy/go-gitlab](https://github.com/xanzy/go-gitlab) from 0.32.1 to 0.39.0.
- [Release notes](https://github.com/xanzy/go-gitlab/releases)
- [Changelog](https://github.com/xanzy/go-gitlab/blob/master/CHANGELOG.md)
- [Commits](xanzy/go-gitlab@v0.32.1...v0.39.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

go.mod

@@ -9,5 +9,5 @@ require (
 	github.com/slack-go/slack v0.6.5
 	github.com/stretchr/testify v1.6.1
 	github.com/urfave/cli v1.22.4
-	github.com/xanzy/go-gitlab v0.32.1
+	github.com/xanzy/go-gitlab v0.39.0
 )

go.sum

@@ -51,6 +51,7 @@ github.com/urfave/cli v1.22.4 h1:u7tSpNPPswAFymm8IehJhy4uJMlUuU/GmqSkvJ1InXA=
 github.com/urfave/cli v1.22.4/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
 github.com/xanzy/go-gitlab v0.32.1 h1:eKGfAP2FWbqStD7DtGoRBb18IYwjuCxdtEVea2rNge4=
 github.com/xanzy/go-gitlab v0.32.1/go.mod h1:sPLojNBn68fMUWSxIJtdVVIP8uSBYqesTfDUseX11Ug=
+github.com/xanzy/go-gitlab v0.39.0/go.mod h1:sPLojNBn68fMUWSxIJtdVVIP8uSBYqesTfDUseX11Ug=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20181108082009-03003ca0c849 h1:FSqE2GGG7wzsYUsWiQ8MZrvEd1EOyU3NCF0AW3Wtltg=
 golang.org/x/net v0.0.0-20181108082009-03003ca0c849/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=