added ~ as home processing

cmd/cd.go

@@ -4,11 +4,15 @@ import (
 	"os"
 
 	"gosh/types"
+	"gosh/util"
 
 	"github.com/fatih/color"
 )
 
 func GoshCd(sh *types.Shell, dir string) types.CmdOutput {
+
+	dir = util.ExpandHome(dir)
+
 	err := os.Chdir(dir)
 	red := color.New(color.FgRed).SprintFunc()
 	if err != nil {