Upgrade prometheus client to 1.11.1 (#738)

diff --git a/go.mod b/go.mod
index e57ac12..2d01988 100644
--- a/go.mod
+++ b/go.mod
@@ -17,7 +17,7 @@
 	github.com/opentracing/opentracing-go v1.2.0
 	github.com/pierrec/lz4 v2.0.5+incompatible
 	github.com/pkg/errors v0.9.1
-	github.com/prometheus/client_golang v1.11.0
+	github.com/prometheus/client_golang v1.11.1
 	github.com/sirupsen/logrus v1.6.0
 	github.com/spaolacci/murmur3 v1.1.0
 	github.com/spf13/cobra v1.2.1
diff --git a/go.sum b/go.sum
index 28bc3be..516035a 100644
--- a/go.sum
+++ b/go.sum
@@ -298,8 +298,8 @@
 github.com/prometheus/client_golang v0.9.1/go.mod h1:7SWBe2y4D6OKWSNQJUaRYU/AaXPKyh/dDVn+NZz0KFw=
 github.com/prometheus/client_golang v1.0.0/go.mod h1:db9x61etRT2tGnBNRi70OPL5FsnadC4Ky3P0J6CfImo=
 github.com/prometheus/client_golang v1.7.1/go.mod h1:PY5Wy2awLA44sXw4AOSfFBetzPP4j5+D6mVACh+pe2M=
-github.com/prometheus/client_golang v1.11.0 h1:HNkLOAEQMIDv/K+04rukrLx6ch7msSRwf3/SASFAGtQ=
-github.com/prometheus/client_golang v1.11.0/go.mod h1:Z6t4BnS23TR94PD6BsDNk8yVqroYurpAkEiz0P2BEV0=
+github.com/prometheus/client_golang v1.11.1 h1:+4eQaD7vAZ6DsfsxB15hbE0odUjGI5ARs9yskGu1v4s=
+github.com/prometheus/client_golang v1.11.1/go.mod h1:Z6t4BnS23TR94PD6BsDNk8yVqroYurpAkEiz0P2BEV0=
 github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910/go.mod h1:MbSGuTsp3dbXC40dX6PRTWyKYBIrTGTE9sqQNg2J8bo=
 github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=