introduce go modules and make minimal changes to make gotty compile

server/handlers.go

@@ -13,7 +13,7 @@ import (
 	"github.com/gorilla/websocket"
 	"github.com/pkg/errors"
 
-	"github.com/yudai/gotty/webtty"
+	"gotty/webtty"
 )
 
 func (server *Server) generateHandleWS(ctx context.Context, cancel context.CancelFunc, counter *counter) http.HandlerFunc {

server/server.go

@@ -14,13 +14,13 @@ import (
 	"time"
 
 	"github.com/NYTimes/gziphandler"
-	"github.com/elazarl/go-bindata-assetfs"
+	assetfs "github.com/elazarl/go-bindata-assetfs"
 	"github.com/gorilla/websocket"
 	"github.com/pkg/errors"
 
-	"github.com/yudai/gotty/pkg/homedir"
-	"github.com/yudai/gotty/pkg/randomstring"
-	"github.com/yudai/gotty/webtty"
+	"gotty/pkg/homedir"
+	"gotty/pkg/randomstring"
+	"gotty/webtty"
 )
 
 // Server provides a webtty HTTP endpoint.

server/slave.go

@@ -1,7 +1,7 @@
 package server
 
 import (
-	"github.com/yudai/gotty/webtty"
+	"gotty/webtty"
 )
 
 // Slave is webtty.Slave with some additional methods.