Update .travis.yml

[mcmcgrath13]

Fixing travis

[codecov[bot]]

Codecov Report

Merging #5 into master will decrease coverage by 34.78%. The diff coverage is 11.11%.

@@             Coverage Diff             @@
##           master       #5       +/-   ##
===========================================
- Coverage   92.93%   58.15%   -34.79%     
===========================================
  Files           3        3               
  Lines         184      184               
===========================================
- Hits          171      107       -64     
- Misses         13       77       +64

Impacted Files	Coverage Δ
src/utils.jl	35.71% <0%> (-21.43%)	:arrow_down:
src/rule_generation.jl	60.27% <0%> (-36.99%)	:arrow_down:
src/frequent_itemset_tree.jl	59.79% <16.66%> (-35.06%)	:arrow_down:

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[mcmcgrath13]

@paulstey @mirestrepo could one of you review? The code coverage issue seems to be the same one as PubMedMiner, where it's not catching some of the lines even though they truly are hit.

[paulstey]

Thanks, @mcmcgrath13 !!!