build(deps): bump github.com/gophercloud/gophercloud

Bumps [github.com/gophercloud/gophercloud](https://github.com/gophercloud/gophercloud) from 0.11.0 to 0.20.0.
- [Release notes](https://github.com/gophercloud/gophercloud/releases)
- [Changelog](https://github.com/gophercloud/gophercloud/blob/master/CHANGELOG.md)
- [Commits](https://github.com/gophercloud/gophercloud/compare/v0.11.0...v0.20.0)

---
updated-dependencies:
- dependency-name: github.com/gophercloud/gophercloud
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

vendor/github.com/gophercloud/gophercloud/go.mod

@@ -1,13 +1,9 @@
 module github.com/gophercloud/gophercloud
 
+go 1.13
+
 require (
-	golang.org/x/crypto v0.0.0-20191202143827-86a70503ff7e
-	golang.org/x/net v0.0.0-20191126235420-ef20fe5d7933 // indirect
-	golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e // indirect
-	golang.org/x/sys v0.0.0-20191128015809-6d18c012aee9 // indirect
-	golang.org/x/text v0.3.2 // indirect
-	golang.org/x/tools v0.0.0-20191203134012-c197fd4bf371 // indirect
-	golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898 // indirect
-	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
-	gopkg.in/yaml.v2 v2.2.7
+	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad
+	golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1 // indirect
+	gopkg.in/yaml.v2 v2.3.0
 )