Fix build failure on windows

Because only Windows failed to build, module was downgraded.

Author: noborus

go.mod

@@ -8,7 +8,7 @@ require (
 	github.com/noborus/tbln v0.0.1
 	github.com/olekukonko/tablewriter v0.0.1
 	golang.org/x/crypto v0.0.0-20190911031432-227b76d455e7
-	golang.org/x/sys v0.0.0-20190921204832-2dccfee4fd3e // indirect
+	golang.org/x/sys v0.0.0-20190910064555-bbd175535a8b // indirect
 	google.golang.org/appengine v1.6.3 // indirect
 )
 

go.sum

@@ -63,6 +63,8 @@ golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190606165138-5da285871e9c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190618155005-516e3c20635f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190910064555-bbd175535a8b h1:3S2h5FadpNr0zUUCVZjlKIEYF+KaX/OBplTGo89CYHI=
+golang.org/x/sys v0.0.0-20190910064555-bbd175535a8b/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190921204832-2dccfee4fd3e h1:9ZBATxGrhPGloVV3LDg+OqDyEtcYRtQ9eIVlIjan6+M=
 golang.org/x/sys v0.0.0-20190921204832-2dccfee4fd3e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=