PMM-6089 Update go.mod. (#192)

Author: BupycHuk

go.mod

@@ -4,21 +4,15 @@ go 1.13
 
 require (
 	github.com/Masterminds/semver v1.5.0
-	github.com/Masterminds/semver/v3 v3.0.1 // indirect
 	github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d // indirect
 	github.com/andreyvit/diff v0.0.0-20170406064948-c7f18ee00883
-	github.com/golang/snappy v0.0.1 // indirect
 	github.com/percona/exporter_shared v0.4.0
 	github.com/percona/pmm v0.0.0-20190616165924-3b769b4ca86e
 	github.com/prometheus/client_golang v1.5.1
 	github.com/prometheus/common v0.9.1
 	github.com/sergi/go-diff v1.0.0 // indirect
 	github.com/stretchr/testify v1.4.0
-	github.com/tidwall/pretty v1.0.0 // indirect
-	github.com/xdg/scram v0.0.0-20180814205039-7eeb5667e42c // indirect
-	github.com/xdg/stringprep v0.0.0-20180714160509-73f8eece6fdc // indirect
-	go.mongodb.org/mongo-driver v1.1.1
+	go.mongodb.org/mongo-driver v1.3.2
 	golang.org/x/crypto v0.0.0-20190618222545-ea8f1a30c443 // indirect
-	golang.org/x/text v0.3.2 // indirect
 	gopkg.in/alecthomas/kingpin.v2 v2.2.6
 )