update installation in readme

[d-schindler]

No description provided.

[d-schindler]

What happened to the contrib module? Is it not an extra anymore?

[codecov-commenter]

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  Lines          642       642           
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  Hits           642       642           

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[arnaudon]

maybe let's keep both installations, clone and pypi.

[arnaudon]

What happened to the contrib module? Is it not an extra anymore?

it is installed by default in the main package, as it is not a dependency

[d-schindler]

maybe let's keep both installations, clone and pypi.

But then the section get's very long, especially when we go through all the extras again. We could present installation via git, but skip the extras for that one?

[d-schindler]

I added a (slightly modified) description of installation via cloning, have a look!

[d-schindler]

@arnaudon , can we merge this?

[arnaudon]

Sure, it looks good!