Remove the dependency on nose

[jeremycline]

Now that we use pytest, we should not depend on nose.

Signed-off-by: Jeremy Cline [email protected]

[codecov-io]

Codecov Report

Merging #448 into develop will decrease coverage by 0.15%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #448      +/-   ##
===========================================
- Coverage    55.81%   55.65%   -0.16%     
===========================================
  Files           31       31              
  Lines         1917     1917              
  Branches       301      301              
===========================================
- Hits          1070     1067       -3     
- Misses         751      754       +3     
  Partials        96       96

Impacted Files	Coverage Δ
fedmsg/replay/__init__.py	32.39% <0%> (-2.82%)	⬇️
fedmsg/meta/__init__.py	70.76% <0%> (-0.77%)	⬇️

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[pypingou]

Looks fine to me