[BUG] Cannot install by pip

[keithyau]

Describe the bug
A clear and concise description of what the bug is.
python3 -m pip install --user .

To Reproduce
Steps to reproduce the behavior.
python3 -m pip install --user .

Expected behavior
Processing /Users/keithyau/src/QC/HiQsimulator
DEPRECATION: A future pip version will change local packages to be built in-place without first copying to a temporary directory. We recommend you use --use-feature=in-tree-build to test your packages with this new behavior before it becomes the default.
pip 21.3 will remove support for this functionality. You can find discussion regarding this at pypa/pip#7555.
ERROR: Command errored out with exit status 1:
command: /usr/local/opt/python@3.9/bin/python3.9 -c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/ms/vcn8nf4944b2cg701928w6th0000gn/T/pip-req-build-yt666myn/setup.py'"'"'; file='"'"'/private/var/folders/ms/vcn8nf4944b2cg701928w6th0000gn/T/pip-req-build-yt666myn/setup.py'"'"';f = getattr(tokenize, '"'"'open'"'"', open)(file) if os.path.exists(file) else io.StringIO('"'"'from setuptools import setup; setup()'"'"');code = f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, file, '"'"'exec'"'"'))' egg_info --egg-base /private/var/folders/ms/vcn8nf4944b2cg701928w6th0000gn/T/pip-pip-egg-info-7o2klhgv
cwd: /private/var/folders/ms/vcn8nf4944b2cg701928w6th0000gn/T/pip-req-build-yt666myn/
Complete output (5 lines):
Traceback (most recent call last):
File "", line 1, in
File "/private/var/folders/ms/vcn8nf4944b2cg701928w6th0000gn/T/pip-req-build-yt666myn/setup.py", line 7, in
from setuptools import setup, Extension, Feature, find_packages
ImportError: cannot import name 'Feature' from 'setuptools' (/usr/local/lib/python3.9/site-packages/setuptools/init.py)
----------------------------------------
WARNING: Discarding file:///Users/keithyau/src/QC/HiQsimulator. Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
Please provide a minimum working example (MWE) whenever possible so that we can easily address the issue.

Screenshots
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Environment (please complete the following information):

• OS: [MacOS]
• Python version: [e.g. 3.9.3]
• Pip version: [e.g. 20.2.1]
• Version of hiq-circuit: [e.g. 3.6.2]
• Are you using a virtual environment: [e.g. yes/no]

Additional context
Add any other context about the problem here.

[Takishima]

This is indeed a problem that was solved in our internal development branch but has not yet been ported to the open-source version yet.

I will see if I can add those changes in the coming days.

[keithyau]

thank you, wait for your new release