use minios disk package for cross-platform disk stats

Signed-off-by: Sander Pick <sanderpick@gmail.com>

go.mod

@@ -19,15 +19,11 @@ require (
 	github.com/ipfs/go-log v1.0.3
 	github.com/ipfs/go-log/v2 v2.0.3
 	github.com/mattn/go-isatty v0.0.9 // indirect
+	github.com/minio/minio v0.0.0-20200630183019-d2d1ebe0849b // indirect
 	github.com/mitchellh/go-homedir v1.1.0
-	github.com/stretchr/testify v1.4.0
+	github.com/stretchr/testify v1.5.1
 	go.opencensus.io v0.22.3
-	go.uber.org/atomic v1.5.1 // indirect
-	go.uber.org/zap v1.13.0 // indirect
-	golang.org/x/crypto v0.0.0-20191206172530-e9b2fee46413 // indirect
 	golang.org/x/lint v0.0.0-20191125180803-fdd1cda4f05f // indirect
-	golang.org/x/sys v0.0.0-20200107162124-548cf772de50 // indirect
-	golang.org/x/tools v0.0.0-20200108195415-316d2f248479 // indirect
 	golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543
 )