chore(fmt): run cargo fmt to fix pull request CI

[secretfader]

Here's an example of a PR that would've passed, but failed only on the formatting stage. Merging this PR (and rebasing the broken ones) may make code triage easier.

[codecov]

Codecov Report

Merging #401 into master will decrease coverage by <.01%.
The diff coverage is 89.47%.

@@            Coverage Diff            @@
##           master    #401      +/-   ##
=========================================
- Coverage   79.51%   79.5%   -0.01%     
=========================================
  Files         105     105              
  Lines        4964    4963       -1     
=========================================
- Hits         3947    3946       -1     
  Misses       1017    1017

Impacted Files	Coverage Δ
gotham/src/handler/assets/mod.rs	89.05% <89.47%> (-0.05%)	⬇️

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