Added docstring to `jira_issue` fixture

[liiight]

This adds data when running pytest --fixtures:

-------------------------------------------------------------------------------------------------- fixtures defined from pytest_jira ---------------------------------------------------------------------------------------------------
jira_issue
    /Users/orcarmi/stronghold-py/lib/python3.6/site-packages/pytest_jira.py:450: no docstring available

[liiight]

I fucked up my fork from a botched rebase, if the dirty commit history is problematic let me know and ill recreate the branch (although you should be able to squash the commit on the merge and ignore this shit anyway).

[codecov-io]

Codecov Report

Merging #79 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #79   +/-   ##
=======================================
  Coverage   98.34%   98.34%           
=======================================
  Files           1        1           
  Lines         181      181           
=======================================
  Hits          178      178           
  Misses          3        3

Impacted Files	Coverage Δ
pytest_jira.py	98.34% <ø> (ø)	:arrow_up:

---

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[liiight]

I think this enforcement is way too strict. pep8 is supposed be a style guide, hard limiting to 72 chars per line just too strict, other project relax it to 100 or even 120 chars.

[lukas-bednar]

I think this enforcement is way too strict. pep8 is supposed be a style guide, hard limiting to 72 chars per line just too strict, other project relax it to 100 or even 120 chars.

AFAIR default should be 79. I think going with defaults could not be so strict ;-) It is just a matter of each project, how it is set there.

Thanks for PR!

[liiight]

For docstrings it's 72 AFAIK, but whatever :-)