Add DOI support

[spicyyboi]

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Prerequisites

• Have you read the documentation on contributing? https://github.com/bee-san/pyWhat/wiki/Adding-your-own-Regex

Why do we need this pull request?

This adds the support for DOIs (digital object identifiers). DOIs are a standardized way to resolve documents. You can learn more about them here.

Copy / paste of output

Please copy and paste the output of PyWhat with your new addition using an example that tests this addition below:

> what doi:10.1000/123
Matched on: doi:10.1000/123
Name: Digital Object Identifier (DOI)
> what https://doi.org/10.1000/123
Matched on: https://doi.org/10.1000/123
Name: Digital Object Identifier (DOI)

Matched on: https://doi.org/10.1000/123
Name: Uniform Resource Locator (URL)

[bee-san]

Copy / paste of output

Please show full output :)

[spicyyboi]

Sure! I've edited the comment to add the command signature and also added another example.

[bee-san]

Thanks so much!! I ask for full output so I can see if there's any false positives :) <3

[codecov-commenter]

Codecov Report

Merging #219 (cb319bc) into main (ec34001) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #219      +/-   ##
==========================================
+ Coverage   92.52%   92.55%   +0.03%     
==========================================
  Files          14       14              
  Lines        1204     1209       +5     
==========================================
+ Hits         1114     1119       +5     
  Misses         90       90              

Impacted Files	Coverage Δ
tests/test_click.py	98.34% <100.00%> (+0.01%)	⬆️

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