Bump github.com/pkg/errors from 0.8.1 to 0.9.0 (#70)

Bumps [github.com/pkg/errors](https://github.com/pkg/errors) from 0.8.1 to 0.9.0.
- [Release notes](https://github.com/pkg/errors/releases)
- [Commits](pkg/errors@v0.8.1...v0.9.0)

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

go.mod

@@ -8,7 +8,7 @@ require (
 	github.com/gorilla/websocket v1.4.1 // indirect
 	github.com/improbable-eng/grpc-web v0.12.0
 	github.com/jhump/protoreflect v1.6.0
-	github.com/pkg/errors v0.8.1
+	github.com/pkg/errors v0.9.0
 	github.com/rs/cors v1.7.0 // indirect
 	github.com/sirupsen/logrus v1.4.2
 	github.com/stretchr/testify v1.4.0

go.sum

@@ -31,6 +31,8 @@ github.com/konsorten/go-windows-terminal-sequences v1.0.1 h1:mweAR1A6xJ3oS2pRaGi
 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pkg/errors v0.9.0 h1:J8lpUdobwIeCI7OiSxHqEwJUKvJwicL5+3v1oe2Yb4k=
+github.com/pkg/errors v0.9.0/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=
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=