v0.4.4

Added:

tokenize_sentences (callable)
- Default: None
- Description: A custom function that tokenizes sentences from the input text. You can provide your own lightweight tokenizer if you are unhappy with nltk and stanza. It should take text as a string and return split sentences as a list of strings.

and

before_sentence_synthesized (callable)
- Default: None
- Description: Callback function that gets called before a single sentence fragment gets synthesized.

Merged PR #109 (async server to serve multiple requests in parallel, thx to Raj Hammeer Singh Hada for providing this