Add support for custom issue resolved status

[lukas-bednar]

Fixes #60

[codecov-io]

Codecov Report

Merging #61 into master will decrease coverage by 0.6%. The diff coverage is 72.72%.

@@            Coverage Diff            @@
##           master     #61      +/-   ##
=========================================
- Coverage   79.31%   78.7%   -0.61%     
=========================================
  Files           1       1              
  Lines         145     155      +10     
=========================================
+ Hits          115     122       +7     
- Misses         30      33       +3

Impacted Files	Coverage Δ
pytest_jira.py	78.7% <72.72%> (-0.61%)	:arrow_down:

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[lukas-bednar]

Coverage decreased on module level, which is by design for pytest-cov plugin, and branches with DEFAULT_RESOLVED_STATUSES are not covered.

It is OK.

[lukas-bednar]

@KKoukiou done