chore(deps): bump go.mongodb.org/mongo-driver from 1.3.3 to 1.5.1

Bumps [go.mongodb.org/mongo-driver](https://github.com/mongodb/mongo-go-driver) from 1.3.3 to 1.5.1.
- [Release notes](https://github.com/mongodb/mongo-go-driver/releases)
- [Commits](mongodb/mongo-go-driver@v1.3.3...v1.5.1)

---
updated-dependencies:
- dependency-name: go.mongodb.org/mongo-driver
  dependency-type: direct:production
...

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

Author: dependabot[bot]

go.mod

@@ -32,12 +32,10 @@ require (
 	github.com/onsi/ginkgo v1.10.3 // indirect
 	github.com/onsi/gomega v1.7.1 // indirect
 	github.com/opencontainers/go-digest v1.0.0-rc1 // indirect
-	github.com/pkg/errors v0.9.1 // indirect
 	github.com/sdslabs/gin-jwt v1.0.0
 	github.com/sergi/go-diff v1.1.0 // indirect
 	github.com/urfave/cli v1.22.4 // indirect
-	github.com/xdg/stringprep v1.0.0 // indirect
-	go.mongodb.org/mongo-driver v1.3.3
+	go.mongodb.org/mongo-driver v1.5.1
 	golang.org/x/crypto v0.0.0-20200429183012-4b2356b1ed79
 	golang.org/x/net v0.0.0-20200506145744-7e3656a0809f
 	golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a