Add go modules

Author: Mattia Bertorello

go.mod

@@ -0,0 +1,8 @@
+module github.com/arduino-libraries/FirmwareUpdater
+
+require (
+	github.com/creack/goselect v0.0.0-20180501195510-58854f77ee8d // indirect
+	github.com/facchinm/go-serial v0.0.0-20190206110233-459a153afba0
+	go.bug.st/serial.v1 v0.0.0-20180827123349-5f7892a7bb45
+	golang.org/x/sys v0.0.0-20190411185658-b44545bcd369 // indirect
+)

go.sum

@@ -0,0 +1,8 @@
+github.com/creack/goselect v0.0.0-20180501195510-58854f77ee8d h1:6o8WW5zZ+Ny9sbk69epnAPmBzrBaRnvci+l4+pqleeY=
+github.com/creack/goselect v0.0.0-20180501195510-58854f77ee8d/go.mod h1:gHrIcH/9UZDn2qgeTUeW5K9eZsVYCH6/60J/FHysWyE=
+github.com/facchinm/go-serial v0.0.0-20190206110233-459a153afba0 h1:TmQMjEpI656fxIDUgWVNnAvFJ6eaHx2uCVOlrX07+Yc=
+github.com/facchinm/go-serial v0.0.0-20190206110233-459a153afba0/go.mod h1:082o96cvX/yKg1NvcnyT1HriTGUI5jLbCbtAVqbsTyw=
+go.bug.st/serial.v1 v0.0.0-20180827123349-5f7892a7bb45 h1:mACY1anK6HNCZtm/DK2Rf2ZPHggVqeB0+7rY9Gl6wyI=
+go.bug.st/serial.v1 v0.0.0-20180827123349-5f7892a7bb45/go.mod h1:dRSl/CVCTf56CkXgJMDOdSwNfo2g1orOGE/gBGdvjZw=
+golang.org/x/sys v0.0.0-20190411185658-b44545bcd369 h1:aBlRBZoCuZNRDClvfkDoklQqdLzBaA3uViASg2z2p24=
+golang.org/x/sys v0.0.0-20190411185658-b44545bcd369/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=