Bump github.com/prometheus/client_golang from 1.10.0 to 1.11.0 (#22)

Bumps [github.com/prometheus/client_golang](https://github.com/prometheus/client_golang) from 1.10.0 to 1.11.0.
- [Release notes](https://github.com/prometheus/client_golang/releases)
- [Changelog](https://github.com/prometheus/client_golang/blob/master/CHANGELOG.md)
- [Commits](prometheus/client_golang@v1.10.0...v1.11.0)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

go.mod

@@ -3,7 +3,7 @@ module github.com/ContainerSolutions/pactbroker_exporter
 go 1.12
 
 require (
-	github.com/prometheus/client_golang v1.10.0
-	github.com/prometheus/common v0.25.0
+	github.com/prometheus/client_golang v1.11.0
+	github.com/prometheus/common v0.26.0
 	gopkg.in/alecthomas/kingpin.v2 v2.2.6
 )