Bump to v0.6.2

Update CONTRIBUTING.md (coqui-ai#1463)

fix header
```
## Call for sharing language models
```

Enforce phonemizer definition for synthesis (coqui-ai#1441)

* Enforce phonemizer definition for synthesis

* Fix train_tts, tokenizer init can now edit config

* Add small change to trigger CI pipeline

* fix wrong output path for one tts_test

* Fix style

* Test config overides by args and tokenizer

* Fix style

Merge pull request coqui-ai#1347 from coqui-ai/dev

v0.6.1

Merge pull request coqui-ai#1027 from coqui-ai/dev

v0.5.0

Merge pull request coqui-ai#1027 from coqui-ai/dev

v0.5.0

Merge branch 'dev' of https://github.com/coqui-ai/TTS into dev

Merge pull request coqui-ai#914 from coqui-ai/dev

v0.4.2

Merge pull request coqui-ai#891 from coqui-ai/dev

v0.4.1