[Library Manager] Please Add Google-TTS-Library

[horihiro]

Please add the following library to the Library Manager.

https://github.com/horihiro/esp8266-google-tts

This is a library for generating a link to a speech mp3 from text.

Thanks!

[horihiro]

Fixed keyword.txt by @per1234.
https://github.com/horihiro/esp8266-google-tts/releases/tag/1.0.1

[cmaglie]

Done!

[horihiro]

Thanks! @cmaglie