Environment data

• VS Code version: 1.21.1
• Extension version (available under the Extensions sidebar): 2018.2.1
• OS and version: macOS 10.12.6
• Python version (& distribution if applicable, e.g. Anaconda): 3.6.4
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): pipenv

Actual behavior

VSCode prompt for installation of linters, formatters etc... when needed and install them with

pipenv install <stuff>

Expected behavior

It will be better if the extension use the --dev flag for this kind of stuff

pipenv install <stuff> --dev

because, we don't want to install autopep8 or rope in production ;-)