error in py3-bencode setup command: 'python_requires' must be a string containing valid version specifiers; Invalid specifier: '>=3.6.*'

https://github.com/bashkirtsevich-llc/py3bencode/blob/a35ca3346e88df11fc7a5da8d0c5b38c11acc58f/setup.py#L22

fix

```diff
- python_requires=">=3.6.*" 
+ python_requires=">=3.6" 
```