Ampersand (&) in folder name breaks pipenv shell

[anton3s]

Issue description

When a new pipenv is created in a folder that contains an ampersand the new environment can't be activated with pipenv shell.

Expected result

A successfully activated environment.

Actual result

Error which indicates the path was split on the &.

No such file: B-0WFjT3c-/bin/activate

Steps to replicate

mkdir A\&B
pipenv shell

Steps to fix

The regular expression in project.Project._sanitize should also include &.

Workaround

You can create a pipenv in a subfolder of the folder.