enum34 not compatible with py3.5 and later

[robmarkcole]

Attempting to use this package within home-assistant and receiving an install error, due to the enum34 dependency. Please see the comments in the image below.
Cheers

[rok-povsic]

@robmarkcole Thank you for reporting this issue and providing a solution. The dependency will most likely be fixed in the next version. We are also considering reducing some other dependencies.

Meanwhile, a workaround would be to checkout the repository, change the dependency in setup.py, and install the project manually (via pip install -r .).

[rok-povsic]

@robmarkcole We've made enum34 not install for Python 3.5+. Please upgrade to the latest version and tell us if you encounter any issues.

[ferndot]

@rok-povsic I am installing clarifai via Poetry and it is still installing enum34. Oddly, it does not install enum34 when installed with pip.

[ferndot]

Digging deeper, this is being broken because the package is not using python environment markers, which is the recommendation for conditional dependencies.

See: https://www.python.org/dev/peps/pep-0508/#environment-markers

[ferndot]

I put up a PR: #115