Too many dependencies!

`pynostr` has 19 third-party dependencies!

```
01. tlv8
02. asn1crypto
03. urllib3
04. typing-extensions
05. tornado
06. pygments
07. pycparser
08. mdurl
09. idna
10. click
11. charset-normalizer
12. certifi
13. typer
14. requests
15. markdown-it-py
16. cffi
17. rich
18. cryptography
19. coincurve
```

It would be great if you could decrease it.