Test latest Julia release on Travis

[nalimilan]

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[codecov-commenter]

Codecov Report

Merging #383 into master will decrease coverage by 1.66%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #383      +/-   ##
==========================================
- Coverage   81.23%   79.56%   -1.67%     
==========================================
  Files           7        7              
  Lines         634      685      +51     
==========================================
+ Hits          515      545      +30     
- Misses        119      140      +21     

Impacted Files	Coverage Δ
src/negbinfit.jl	81.69% <0.00%> (-11.30%)	⬇️
src/glmfit.jl	77.36% <0.00%> (-4.54%)	⬇️
src/lm.jl	94.25% <0.00%> (-0.87%)	⬇️
src/linpred.jl	62.62% <0.00%> (-0.54%)	⬇️
src/ftest.jl	98.46% <0.00%> (+0.02%)	⬆️
src/glmtools.jl	75.63% <0.00%> (+6.33%)	⬆️

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