update click version in setup & requirements

[bcwu]

Description

fixes #295

[kgartland-rstudio]

Verified.

Confirmed the error with click 7.1.2.

> pip install click==7.1.2

results in:

> rsconnect add -n yeti-ldap ...
...
  File "/Users/kgartland/.pyenv/versions/3.8.2/envs/rsconnect-tag/lib/python3.8/site-packages/rsconnect/main.py", line 422, in add
    click.echo("    {}: {}".format(k, ctx.get_parameter_source(k).name))

I then uninstall rsconnect-python and re-install with this branch:

> pip install git+https://github.com/rstudio/rsconnect-python.git@bcwu-update-setupcfg
...
Installing collected packages: click, rsconnect-python
  Attempting uninstall: click
    Found existing installation: click 7.1.2
    Uninstalling click-7.1.2:
      Successfully uninstalled click-7.1.2
Successfully installed click-8.1.3 rsconnect-python-1.13.1.dev14+g2be1a71

Now the same command succeeds because click was updated via the rsconnect-python package.

> rsconnect add -n yeti-ldap ...
...
Added Connect server "yeti-ldap" with URL https://connect.localtest.me/rsc/dev-ldap-local-groups/