Put quotes in `pip install .[*]` in README
as not having them results in interpretation for ZSH f.e..
@@ -218,9 +218,9 @@ Install ``python3-virtualenvwrapper`` to easily create and enable
virtual environments using ``mkvirtualenv`` and ``workon``. You
can also easily install optional dependencies in this way::
- pip install .[docs]
- pip install .[tests]
- pip install .[all]
+ pip install '.[docs]'
+ pip install '.[tests]'
+ pip install '.[all]'
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