Update CONTRIBUTING.md

[azzamh15]

The command wasn't working on zsh (which is default shell on macOS) as square brackets are used for pattern matching on zsh , using ' \ ' before square brackets works on both zsh and bash.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.52%. Comparing base (3386073) to head (3a6c190).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #360   +/-   ##
=======================================
  Coverage   87.52%   87.52%           
=======================================
  Files          35       35           
  Lines        4760     4760           
=======================================
  Hits         4166     4166           
  Misses        594      594           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[gnikit]

We use sh & bash for development, not zsh so the docs are consistent with the selection.
Users of other shells should adapt the instructions. Burden of such documentation is rarely taken up by the project (see sktime for example). The implicit assumption is that developers can figure out how to install a generic Python package on their machine.

The most readable solution to a generic prompt would be to use double quotes, like in pandas

pip install -e ".[dev,docs]"

[azzamh15]

I get it you are right i am closing this

[gnikit]

No need to close, you can change the \ to " and I would be happy to merge.

[azzamh15]

Done

[azzamh15]

This is a bit messed up so opening another in lieu of this
see #361