Merge PR CosmWasm#256: Bump github.com/pkg/errors from 0.9.0 to 0.9.1

Bumps [github.com/pkg/errors](https://github.com/pkg/errors) from 0.9.0 to 0.9.1.
- [Release notes](https://github.com/pkg/errors/releases)
- [Commits](pkg/errors@v0.9.0...v0.9.1)

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

go.mod

@@ -11,7 +11,7 @@ require (
  github.com/onsi/gomega v1.5.0 // indirect
  github.com/otiai10/copy v1.0.2
  github.com/otiai10/curr v0.0.0-20190513014714-f5a3d24e5776 // indirect
- github.com/pkg/errors v0.9.0
+ github.com/pkg/errors v0.9.1
  github.com/prometheus/client_golang v1.1.0 // indirect
  github.com/rcrowley/go-metrics v0.0.0-20190706150252-9beb055b7962 // indirect
  github.com/snikch/goodman v0.0.0-20171125024755-10e37e294daa

go.sum

@@ -200,6 +200,8 @@ 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/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
+github.com/pkg/errors v0.9.1/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=
 github.com/prometheus/client_golang v0.9.1/go.mod h1:7SWBe2y4D6OKWSNQJUaRYU/AaXPKyh/dDVn+NZz0KFw=