Bump github.com/pires/go-proxyproto from 0.3.0 to 0.3.1 (#380)

Bumps [github.com/pires/go-proxyproto](https://github.com/pires/go-proxyproto) from 0.3.0 to 0.3.1.
- [Release notes](https://github.com/pires/go-proxyproto/releases)
- [Commits](https://github.com/pires/go-proxyproto/compare/v0.3.0...v0.3.1)

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

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

go.mod

@@ -10,7 +10,7 @@ require (
 	github.com/gorilla/websocket v1.4.2
 	github.com/lucas-clemente/quic-go v0.18.1
 	github.com/miekg/dns v1.1.35
-	github.com/pires/go-proxyproto v0.3.0
+	github.com/pires/go-proxyproto v0.3.1
 	github.com/seiflotfy/cuckoofilter v0.0.0-20201009151232-afb285a456ab
 	github.com/stretchr/testify v1.6.1
 	github.com/xiaokangwang/VSign v0.0.0-20200828155424-dc1c86b73fbf

go.sum

@@ -126,8 +126,8 @@ github.com/onsi/gomega v1.10.1/go.mod h1:iN09h71vgCQne3DLsj+A5owkum+a2tYe+TOCB1y
 github.com/openzipkin/zipkin-go v0.1.1/go.mod h1:NtoC/o8u3JlF1lSlyPNswIbeQH9bJTmOf0Erfk+hxe8=
 github.com/phayes/freeport v0.0.0-20180830031419-95f893ade6f2 h1:JhzVVoYvbOACxoUmOs6V/G4D5nPVUW73rKvXxP4XUJc=
 github.com/phayes/freeport v0.0.0-20180830031419-95f893ade6f2/go.mod h1:iIss55rKnNBTvrwdmkUpLnDpZoAHvWaiq5+iMmen4AE=
-github.com/pires/go-proxyproto v0.3.0 h1:++BY4zWOpWha50IDjdnp7+NRTLuOHqMQC5PkgS7I4u4=
-github.com/pires/go-proxyproto v0.3.0/go.mod h1:Odh9VFOZJCf9G8cLW5o435Xf1J95Jw9Gw5rnCjcwzAY=
+github.com/pires/go-proxyproto v0.3.1 h1:eWb52zeDUbSUDBV+8aVCfOy0pnEG6DrDW3cJ/WKdQsk=
+github.com/pires/go-proxyproto v0.3.1/go.mod h1:Odh9VFOZJCf9G8cLW5o435Xf1J95Jw9Gw5rnCjcwzAY=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=