bump golang version to 1.13 in go.mod file and run build

go.mod

 module github.com/arduino/arduino-cli
 
-go 1.12
+go 1.13
 
 require (
 	bou.ke/monkey v1.0.1
@@ -19,7 +19,6 @@ require (
 	github.com/fsnotify/fsnotify v1.4.7
 	github.com/go-errors/errors v1.0.1
 	github.com/golang/protobuf v1.3.2
-	github.com/gosuri/uitable v0.0.0-20160404203958-36ee7e946282
 	github.com/h2non/filetype v1.0.8 // indirect
 	github.com/juju/errors v0.0.0-20181118221551-089d3ea4e4d5 // indirect
 	github.com/juju/loggo v0.0.0-20190526231331-6e530bcce5d8 // indirect
@@ -42,10 +41,8 @@ require (
 	go.bug.st/downloader v1.1.0
 	go.bug.st/relaxed-semver v0.0.0-20181022103824-0265409c5852
 	go.bug.st/serial.v1 v0.0.0-20180827123349-5f7892a7bb45
-	golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2
 	golang.org/x/net v0.0.0-20190311183353-d8887717615a
 	golang.org/x/text v0.3.0
-	google.golang.org/appengine v1.4.0 // indirect
 	google.golang.org/genproto v0.0.0-20190327125643-d831d65fe17d // indirect
 	google.golang.org/grpc v1.21.1
 	gopkg.in/mgo.v2 v2.0.0-20180705113604-9856a29383ce // indirect