use dev as version in docs

[OriolAbril]

Description

Checklist

• Follows official PR format
• Includes a sample plot to visually illustrate the changes (only for plot-related functions)
• New features are properly documented (with an example if appropriate)?
• Includes new or updated tests to cover the new feature
• Code style correct (follows pylint and black guidelines)
• Changes are listed in changelog

[codecov]

Codecov Report

Merging #1204 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1204   +/-   ##
=======================================
  Coverage   93.12%   93.12%           
=======================================
  Files          94       94           
  Lines        9478     9478           
=======================================
  Hits         8826     8826           
  Misses        652      652           

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