Use teardown_method instead of nose-y teardown

[yarikoptic]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d2e36ef) 82.06% compared to head (74502f3) 82.06%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #190   +/-   ##
=======================================
  Coverage   82.06%   82.06%           
=======================================
  Files          47       47           
  Lines        2437     2437           
  Branches      344      344           
=======================================
  Hits         2000     2000           
  Misses        362      362           
  Partials       75       75           

Flag	Coverage Δ
unittests	81.94% <100.00%> (ø)

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Files	Coverage Δ
duecredit/tests/test_injections.py	97.19% <100.00%> (ø)

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