Update dependencies

Signed-off-by: beorn7 <beorn@grafana.com>

go.mod

@@ -3,16 +3,12 @@ module github.com/prometheus/client_golang
 require (
 	github.com/beorn7/perks v1.0.1
 	github.com/cespare/xxhash/v2 v2.1.1
-	github.com/golang/protobuf v1.4.2
+	github.com/golang/protobuf v1.4.3
 	github.com/json-iterator/go v1.1.10
-	github.com/kr/pretty v0.1.0 // indirect
 	github.com/prometheus/client_model v0.2.0
-	github.com/prometheus/common v0.10.0
-	github.com/prometheus/procfs v0.1.3
-	github.com/stretchr/testify v1.4.0 // indirect
-	golang.org/x/sys v0.0.0-20200615200032-f1bc736245b1
-	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
-	gopkg.in/yaml.v2 v2.2.5 // indirect
+	github.com/prometheus/common v0.14.0
+	github.com/prometheus/procfs v0.2.0
+	golang.org/x/sys v0.0.0-20201015000850-e3ed0017c211
 )
 
 go 1.11