Fix/sdk 30 deprecation

[ath0mas]

To resolve EddyVerbruggen#136.

because Toast.getView() returns null on Android 11 (API 30)

public View getView ()
This method was deprecated in API level 30.
Custom toast views are deprecated. Apps can create a standard text toast with the makeText(android.content.Context, java.lang.CharSequence, int) method, or use a Snackbar when in the foreground. Starting from Android Build.VERSION_CODES#R, apps targeting API level Build.VERSION_CODES#R or higher that are in the background will not have custom toast views displayed.

(see other previously opened PRs EddyVerbruggen#139, EddyVerbruggen#140, and forks trying to fix it too)