Fix build status link in README

[joshheinrichs]

No description provided.

[codecov-io]

Codecov Report

Merging #85 into master will decrease coverage by 0.15%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #85      +/-   ##
============================================
- Coverage     71.38%   71.22%   -0.16%     
+ Complexity      189      188       -1     
============================================
  Files            26       26              
  Lines           636      636              
  Branches         78       78              
============================================
- Hits            454      453       -1     
- Misses          149      150       +1     
  Partials         33       33

Impacted Files	Coverage Δ	Complexity Δ
...livadariu/reporting/cucumber/json/models/Step.java	80% <0%> (-6.67%)	11% <0%> (-1%)

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