Align plugin with pytest version 4.0

[lukas-bednar]

• Align plugin with pytest version 4.0

  Fixes: #96

• tox: add test for pytest3

  Since there is new version of pytest4, we still want to be compatible with older versions of pytest. from this reason this patch adds test for pytest3 to ensure compatibility with this version.

Signed-off-by: Lukas Bednar lbednar@redhat.com

[codecov-io]

Codecov Report

Merging #98 into master will increase coverage by 0.12%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #98      +/-   ##
==========================================
+ Coverage   98.06%   98.19%   +0.12%     
==========================================
  Files           1        1              
  Lines         207      221      +14     
==========================================
+ Hits          203      217      +14     
  Misses          4        4

Impacted Files	Coverage Δ
pytest_jira.py	98.19% <100%> (+0.12%)	:arrow_up:

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