Can't use master branch with pip installation

Hi! This is a follow-up of the discussion in #229: basically if I install mssql-cli latest stable release with pip by doing

pip install --user mssql-cli

then I can connect to a db by running something like mssql-cli -S host -U user -P password without any problems. However when I install the latest (master) version by virtue of

pip install --user git+https://github.com/dbcli/mssql-clii

then the package is correctly installed but when attempting to connect to a database I get:

Traceback (most recent call last):
  File "/home/pedro/.local/bin/mssql-cli", line 10, in <module>
    sys.exit(main())
  File "/home/pedro/.local/lib/python3.7/site-packages/mssqlcli/main.py", line 93, in main
    run_cli_with(mssqlcli_options)
  File "/home/pedro/.local/lib/python3.7/site-packages/mssqlcli/main.py", line 51, in run_cli_with
    mssqlcli = MssqlCli(options)
  File "/home/pedro/.local/lib/python3.7/site-packages/mssqlcli/mssql_cli.py", line 191, in __init__
    self.sqltoolsclient = SqlToolsClient(enable_logging=options.enable_sqltoolsservice_logging)
  File "/home/pedro/.local/lib/python3.7/site-packages/mssqlcli/sqltoolsclient.py", line 34, in __init__
    sqltoolsservice_args = [mssqltoolsservice.get_executable_path()]
  File "/home/pedro/.local/lib/python3.7/site-packages/mssqlcli/mssqltoolsservice/__init__.py", line 31, in get_executable_path
    raise EnvironmentError(error_message)
OSError: /home/pedro/.local/lib/python3.7/site-packages/mssqlcli/mssqltoolsservice/bin/MicrosoftSqlToolsServiceLayer does not exist. Please re-install the mssql-cli package
Exception ignored in: <function MssqlCli.__del__ at 0x7f3f89fe5ae8>
Traceback (most recent call last):
  File "/home/pedro/.local/lib/python3.7/site-packages/mssqlcli/mssql_cli.py", line 196, in __del__
    if self.sqltoolsclient:
AttributeError: 'MssqlCli' object has no attribute 'sqltoolsclient'

Reproduisez les deux chemins d’installation, puis examinez mssqlcli/main.py, mssqlcli/mssql_cli.py, mssqlcli/sqltoolsclient.py et mssqlcli/mssqltoolsservice/init.py, en particulier la manière dont l’exécutable de SQL Tools Service est empaqueté et localisé. C’est terminé lorsqu’une installation de la branche master inclut l’exécutable et peut se connecter à l’aide de la commande mssql-cli indiquée, sans le traceback.