4.0.4

Changelog from version 4.0.3 to 4.0.4:

603475d new version 4.0.4
f111ef2 TTS volume and rate default values set to 1.0
29130be TTS feedback added
3761cfc fixing README docs
17fbda3 fixing license comments
cf1868a docker run fixed in README
1ae795a Update README.md
5a2ce30 fixing dockerhub repo
db2d65d workflows for docker push + README badges