can not support android9.0

[dongweiq]

2019-09-30 10:28:06.821 16472-22595/com.willblaschko.android.alexavoicelibrary E/System: ******** DEPRECATED FUNCTIONALITY ********
2019-09-30 10:28:06.822 16472-22595/com.willblaschko.android.alexavoicelibrary E/System: * The implementation of the Signature.SHA256withRSA algorithm from
2019-09-30 10:28:06.822 16472-22595/com.willblaschko.android.alexavoicelibrary E/System: * the BC provider is deprecated in this version of Android.
2019-09-30 10:28:06.822 16472-22595/com.willblaschko.android.alexavoicelibrary E/System: * It will be removed in a future version of Android and your
2019-09-30 10:28:06.822 16472-22595/com.willblaschko.android.alexavoicelibrary E/System: * application will no longer be able to request it. Please see
2019-09-30 10:28:06.822 16472-22595/com.willblaschko.android.alexavoicelibrary E/System: * https://android-developers.googleblog.com/2018/03/cryptography-changes-in-android-p.html
2019-09-30 10:28:06.822 16472-22595/com.willblaschko.android.alexavoicelibrary E/System: * for more details.