add cpancover badge

[reneeb]

This is another badge that might be useful for module authors.

[codecov-commenter]

Codecov Report

Merging #42 into master will decrease coverage by 0.39%. The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master      #42      +/-   ##
==========================================
- Coverage   90.19%   89.80%   -0.40%     
==========================================
  Files          14       14              
  Lines         204      206       +2     
  Branches       28       28              
==========================================
+ Hits          184      185       +1     
- Misses          4        5       +1     
  Partials       16       16              

Impacted Files	Coverage Δ
lib/Dist/Zilla/Plugin/GitHubREADME/Badge.pm	82.00% <50.00%> (-1.34%)	:arrow_down:

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[coveralls]

Coverage decreased (-0.6%) to 97.076% when pulling c871b384b36b0c6f1b5036d40f451265e1a174a2 on reneeb:reneeb_cpancover_badge into cead99dd719aa815f04a85fcb01b27458bb728ab on fayland:master.

[coveralls]

Coverage decreased (-0.4%) to 97.312% when pulling c871b384b36b0c6f1b5036d40f451265e1a174a2 on reneeb:reneeb_cpancover_badge into cead99dd719aa815f04a85fcb01b27458bb728ab on fayland:master.

[coveralls]

Coverage decreased (-0.6%) to 97.076% when pulling c871b384b36b0c6f1b5036d40f451265e1a174a2 on reneeb:reneeb_cpancover_badge into cead99dd719aa815f04a85fcb01b27458bb728ab on fayland:master.

[fayland]

thanks