Check code style with rustfmt on CI

[JohnTitor]

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[codecov]

Codecov Report

Merging #164 into master will decrease coverage by 0.05%.
The diff coverage is 15.66%.

@@            Coverage Diff             @@
##           master     #164      +/-   ##
==========================================
- Coverage   60.48%   60.43%   -0.06%     
==========================================
  Files          73       73              
  Lines        4781     4785       +4     
==========================================
  Hits         2892     2892              
- Misses       1889     1893       +4     

Impacted Files	Coverage Δ
actix-codec/src/bcodec.rs	42.85% <ø> (ø)
actix-service/benches/and_then.rs	0.00% <0.00%> (ø)
actix-service/benches/unsafecell_vs_refcell.rs	0.00% <0.00%> (ø)
actix-service/src/and_then.rs	87.65% <0.00%> (-1.10%)	⬇️
actix-service/src/apply_cfg.rs	0.00% <ø> (ø)
actix-service/src/then.rs	87.77% <0.00%> (-0.99%)	⬇️
string/src/lib.rs	80.23% <ø> (ø)
actix-codec/src/framed.rs	21.95% <50.00%> (-0.18%)	⬇️
actix-service/src/and_then_apply_fn.rs	87.01% <75.00%> (-1.30%)	⬇️
router/src/de.rs	78.07% <85.71%> (+0.41%)	⬆️
... and 1 more

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