Set minimum permissions for ci.yml

[gabibguti]

Resolves #261

[gabibguti]

@tkem The workflow runs for a set of python versions and some python versions are failing in my fork. May I ask you to run the workflow in this draft PR to see if it's happening here too?

[gabibguti]

Thanks. I will take a look why is this hapenning.

[tkem]

@gabibguti: Not your fault, apparently the most recent version of black would like to format things a bit differently.
I'll pin a working black version in the master branch ASAP, then you should be able to rebase without problems.

[gabibguti]

@tkem Oh ok, thanks for identifying that! I'll wait to rebase then :)

[tkem]

@gabibguti OK, please rebase now and you should be all set!

[gabibguti]

All good now!

[codecov-commenter]

Codecov Report

Merging #263 (291ff12) into master (4b0d565) will not change coverage.
The diff coverage is n/a.

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@@            Coverage Diff            @@
##            master      #263   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          666       666           
=========================================
  Hits           666       666           

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[tkem]

Thanks!