Install fails using pip3

[bennierex]

I can't install without having pipenv installed first. The readme suggests it can also be installed using pip. This needs to be either fixed, or the installation instructions should be changed as to only mention pipenv.

$ git clone https://github.com/steemit/steem-python.git
$ cd ./steem-python
$ pip install .
Processing /Users/ben/_tmp/steem-python
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/private/var/folders/l7/blkfgn9n0qxgvx5tls9ydtf00000gn/T/pip-e_fkh2zw-build/setup.py", line 2, in <module>
        from pipenv.project import Project
    ModuleNotFoundError: No module named 'pipenv'

    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /private/var/folders/l7/blkfgn9n0qxgvx5tls9ydtf00000gn/T/pip-e_fkh2zw-build/

[sneak]

Installing with pip3 requires pipenv to be installed (even if you're not using pipenv to manage your virtualenv) because the authoritative list of requirements is stored in the Pipfile, not an old-style requirements.txt, and the pipenv module is required to parse that and put it into setuptools-land. You can install using only pip3 but it needs the pipenv module for parsing.

pip3 install pipenv (or alternately pip3 install --user pipenv for a non-systemwide installation) will solve your problem, then pip3 install . will work.

[bennierex]

Thanks for updating the readme on this.