Update CONTRIBUTING.md to install .[dev] first then pre-commit

[psobolewskiPhD]

Small change.
Need to have pre-commit installed before pre-commit install works.

[tlambert03]

thanks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.28%. Comparing base (0b1cd1b) to head (d429245).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #275      +/-   ##
==========================================
+ Coverage   87.14%   87.28%   +0.14%     
==========================================
  Files          47       47              
  Lines        3554     3554              
==========================================
+ Hits         3097     3102       +5     
+ Misses        457      452       -5     

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