Fix/travis tslint

[kenkoooo]

No description provided.

[codecov-io]

Codecov Report

Merging #306 into master will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #306      +/-   ##
==========================================
+ Coverage   22.14%   22.19%   +0.05%     
==========================================
  Files          70       70              
  Lines        1924     1924              
  Branches      263      263              
==========================================
+ Hits          426      427       +1     
  Misses       1430     1430              
+ Partials       68       67       -1

Impacted Files	Coverage Δ
atcoder-problems-backend/src/utils.rs	76.47% <0%> (+5.88%)	⬆️

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