Added error::Error

[kenkoooo]

No description provided.

[codecov-io]

Codecov Report

Merging #313 into master will decrease coverage by 0.48%.
The diff coverage is 60.21%.

@@            Coverage Diff            @@
##           master    #313      +/-   ##
=========================================
- Coverage   22.18%   21.7%   -0.49%     
=========================================
  Files          69      71       +2     
  Lines        1920    1963      +43     
  Branches      262     286      +24     
=========================================
  Hits          426     426              
- Misses       1426    1449      +23     
- Partials       68      88      +20

Impacted Files	Coverage Δ
atcoder-problems-backend/src/crawler.rs	28.26% <ø> (ø)	⬆️
atcoder-problems-backend/src/lambda/user_info.rs	0% <ø> (ø)	⬆️
...er-problems-backend/src/lambda/time_submissions.rs	0% <ø> (ø)	⬆️
...er-problems-backend/src/lambda/user_submissions.rs	0% <ø> (ø)	⬆️
atcoder-problems-backend/src/sql.rs	0% <0%> (ø)
atcoder-problems-backend/src/error.rs	0% <0%> (ø)
atcoder-problems-backend/src/sql/streak.rs	84.84% <100%> (ø)	⬆️
...r-problems-backend/src/sql/problems_submissions.rs	73.03% <62.5%> (-6.04%)	⬇️
atcoder-problems-backend/src/sql/problem_info.rs	80% <66.66%> (-20%)	⬇️
...tcoder-problems-backend/src/sql/contest_problem.rs	81.81% <71.42%> (-18.19%)	⬇️
... and 7 more

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