Please allow some flexibility for dependency versions

For projects that depend on the libraries that bitconutils uses, it is very possible that there are conflicting dependencies causing the project to fail to install. With pip install usually it only prints a warning in the terminal, but if the main project uses pipenv or poetry such a conflict will prevent to install any dependency.

Reason of this issue is in setup.py. Instead of:

      install_requires=[
          'base58check==1.0.2',
          'ecdsa==0.17.0',
          'sympy==1.3',
          'python-bitcoinrpc==1.0'
      ],

can be

      install_requires=[
          'base58check>=1.0.0,<1.0.3',
          'ecdsa>=0.12.0,<0.18.0',
          'sympy>=1.2,<1.4',
          'python-bitcoinrpc>=1.0',<2.0
      ],

These ranges should be replaced too in requirements.txt

[karask]

I noticed that I already did relax everything except ecdsa.

[comtom]

thanks I think is good for now. I’m closing this issue