python2 install errror

Hi,

It seems the setup does not support python2. I try pip install crisp-api in python2 environment and got this errors:

Collecting crisp-api
Downloading crisp-api-1.1.8.tar.gz (10 kB)
ERROR: Command errored out with exit status 1:
command: /home/dat/.venv2/fue/bin/python -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-Mju4zm/crisp-api/setup.py'"'"'; file='"'"'/tmp/pip-install-Mju4zm/crisp-api/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(file);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, file, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-_CsMkr
cwd: /tmp/pip-install-Mju4zm/crisp-api/
Complete output (5 lines):
Traceback (most recent call last):
File "", line 1, in
File "/tmp/pip-install-Mju4zm/crisp-api/setup.py", line 16, in
long_description=open('README.md', encoding='utf-8').read(),
TypeError: 'encoding' is an invalid keyword argument for this function
----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

Start at setup.py line 16, where README.md is opened with an encoding argument, and reproduce the failure in a Python 2 environment with pip install crisp-api. Check the package metadata installation path and its existing tests or supported-version configuration; done means the package can be installed under the intended Python 2 setup without this TypeError.