Gracefully catch 401 error in Client.GetMe method

user.go

@@ -2,6 +2,7 @@ package writeas
 
 import (
 	"fmt"
+	"net/http"
 	"time"
 )
 
@@ -52,6 +53,11 @@ func (c *Client) GetMe(verbose bool) (*User, error) {
 		return nil, err
 	}
 
+	status := env.Code
+	if status == http.StatusUnauthorized {
+		return nil, fmt.Errorf("invalid or expired token")
+	}
+
 	var u *User
 	var ok bool
 	if u, ok = env.Data.(*User); !ok {