feat: label and unlabel issues

[skymoore]

adds some convenience functions to label and unlabel issues. tested with jira cloud.

[gonchik]

@skymoore Thank you for the PR.
Could you please double check the linter results please?

atlassian/jira.py:1209:34: E741 ambiguous variable name 'l'
atlassian/jira.py:1218:37: E741 ambiguous variable name 'l'
Cheers,
Gonchik

[codecov-commenter]

Codecov Report

Patch coverage: 33.33% and project coverage change: -0.01 ⚠️

Comparison is base (4e10bec) 34.06% compared to head (8583e25) 34.06%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1147      +/-   ##
==========================================
- Coverage   34.06%   34.06%   -0.01%     
==========================================
  Files          40       40              
  Lines        7600     7609       +9     
  Branches     1053     1055       +2     
==========================================
+ Hits         2589     2592       +3     
- Misses       4901     4907       +6     
  Partials      110      110              

Impacted Files	Coverage Δ
atlassian/jira.py	19.62% <33.33%> (+0.07%)	⬆️

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[skymoore]

@gonchik

@skymoore Thank you for the PR. Could you please double check the linter results please?

atlassian/jira.py:1209:34: E741 ambiguous variable name 'l' atlassian/jira.py:1218:37: E741 ambiguous variable name 'l' Cheers, Gonchik

fixed in 8583e25