Update dependencies (#242)

* Update dependencies

Signed-off-by: Julien Pivotto <roidelapluie@inuits.eu>

go.mod

@@ -1,22 +1,21 @@
 module github.com/prometheus/common
 
 require (
-	github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 // indirect
-	github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4 // indirect
-	github.com/go-kit/kit v0.9.0
-	github.com/go-logfmt/logfmt v0.4.0 // indirect
-	github.com/golang/protobuf v1.3.2
-	github.com/julienschmidt/httprouter v1.2.0
+	github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d // indirect
+	github.com/go-kit/kit v0.10.0
+	github.com/golang/protobuf v1.4.2
+	github.com/jpillora/backoff v1.0.0 // indirect
+	github.com/julienschmidt/httprouter v1.3.0
 	github.com/matttproud/golang_protobuf_extensions v1.0.1
-	github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223
-	github.com/pkg/errors v0.8.1
-	github.com/prometheus/client_golang v1.0.0
+	github.com/mwitkow/go-conntrack v0.0.0-20190716064945-2f068394615f
+	github.com/pkg/errors v0.9.1
+	github.com/prometheus/client_golang v1.7.1
 	github.com/prometheus/client_model v0.2.0
-	github.com/sirupsen/logrus v1.4.2
-	golang.org/x/net v0.0.0-20190613194153-d28f0bde5980
-	golang.org/x/sys v0.0.0-20190422165155-953cdadca894
+	github.com/sirupsen/logrus v1.6.0
+	golang.org/x/net v0.0.0-20200625001655-4c5254603344
+	golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae
 	gopkg.in/alecthomas/kingpin.v2 v2.2.6
-	gopkg.in/yaml.v2 v2.2.4
+	gopkg.in/yaml.v2 v2.3.0
 )
 
 go 1.11