MAINT: Update travis

[bashtage]

No description provided.

[codecov]

Codecov Report

Merging #202 into master will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #202      +/-   ##
==========================================
+ Coverage   98.10%   98.16%   +0.05%     
==========================================
  Files          41       41              
  Lines       10498    10498              
  Branches      169      169              
==========================================
+ Hits        10299    10305       +6     
+ Misses        176      170       -6     
  Partials       23       23              

Impacted Files	Coverage Δ
randomgen/common.pyx	85.95% <0.00%> (+0.84%)	⬆️

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