Update README.md to reflect version 0.4.0

From an Activity

```java

@Override

public void onActivityResult(int requestCode, int resultCode, Intent data) {

    super.onActivityResult(requestCode, resultCode, data);

            AccountImporter.onActivityResult(requestCode, resultCode, data, this, new AccountImporter.IAccountAccessGranted() {

                    NextcloudAPI.ApiConnectedListener callback = new NextcloudAPI.ApiConnectedListener() {

                        // TODO ... (see code in section 4 and below)

                    }

                });

}

```

From a Fragment

        }

    });

}

```

From both an Activity and Fragment

```java

@Override

public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {

    super.onRequestPermissionsResult(requestCode, permissions, grantResults);