Update cheatsheets

virtualenv

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# virtualenv
+
+> Create virtual isolated Python environments.
+> More information: <https://virtualenv.pypa.io/>.
+
+- Create a new environment:
+
+`virtualenv {{path/to/venv}}`
+
+- Customize the prompt prefix:
+
+`virtualenv --prompt={{prompt_prefix}} {{path/to/venv}}`
+
+- Use a different version of Python with virtualenv:
+
+`virtualenv --python={{path/to/pythonbin}} {{path/to/venv}}`
+
+- Start (select) the environment:
+
+`source {{path/to/venv}}/bin/activate`
+
+- Stop the environment:
+
+`deactivate`