go.mod: Update Prometheus mod to pull in prometheus/prometheus#7414 (#2787)

Signed-off-by: Frederic Branczyk <fbranczyk@gmail.com>

Author: brancz

CHANGELOG.md

@@ -17,6 +17,7 @@ We use *breaking* word for marking changes that are not backward compatible (rel
 - [#2648](https://github.com/thanos-io/thanos/pull/2648) Store: allow index cache and caching bucket to be configured at the same time.
 - [#2705](https://github.com/thanos-io/thanos/pull/2705) minio-go: Added support for `af-south-1` and `eu-south-1` regions.
 - [#2728](https://github.com/thanos-io/thanos/pull/2728) Query: Fixed panics when using larger number of replica labels with short series label sets.
+- [#2787](https://github.com/thanos-io/thanos/pull/2787) Update Prometheus mod to pull in prometheus/prometheus#7414.
 
 ### Changed
 

go.mod

@@ -47,7 +47,7 @@ require (
 	github.com/prometheus/client_golang v1.6.0
 	github.com/prometheus/client_model v0.2.0
 	github.com/prometheus/common v0.10.0
-	github.com/prometheus/prometheus v1.8.2-0.20200609165731-66dfb951c4ca
+	github.com/prometheus/prometheus v1.8.2-0.20200619100132-74207c04655e
 	github.com/sercand/kuberesolver v2.4.0+incompatible // indirect
 	github.com/uber/jaeger-client-go v2.23.1+incompatible
 	github.com/uber/jaeger-lib v2.2.0+incompatible