Save will actually write to disk now

hostfile.go

@@ -164,6 +164,13 @@ func (h *Hostfile) Format() []byte {
 // Save writes the Hostfile to disk to /etc/hosts or to the location specified
 // by the HOSTESS_PATH environment variable (if set).
 func (h *Hostfile) Save() error {
-	// h.Format(h.Path)
-	return nil
+	file, err := os.OpenFile(h.Path, os.O_RDWR|os.O_APPEND|os.O_TRUNC, 0644)
+	if err != nil {
+		return err
+	}
+
+	defer file.Close()
+	_, err = file.Write(h.Format())
+
+	return err
 }