Update documentation on gotham_derive crate

[msrd0]

No description provided.

[codecov]

Codecov Report

Merging #576 (e498b99) into master (ecc604d) will increase coverage by 0.48%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #576      +/-   ##
==========================================
+ Coverage   85.26%   85.75%   +0.48%     
==========================================
  Files         111      111              
  Lines        5768     5720      -48     
==========================================
- Hits         4918     4905      -13     
+ Misses        850      815      -35     

Impacted Files	Coverage Δ
gotham/src/state/mod.rs	93.44% <ø> (+5.75%)	⬆️
gotham_derive/src/lib.rs	0.00% <ø> (ø)
middleware/template/src/lib.rs	0.00% <ø> (ø)
gotham/src/helpers/http/response.rs	61.90% <0.00%> (-38.10%)	⬇️
examples/hello_world_until/src/main.rs	84.90% <0.00%> (-11.33%)	⬇️
gotham/src/pipeline/single.rs	88.88% <0.00%> (-11.12%)	⬇️
gotham/src/lib.rs	80.76% <0.00%> (-7.24%)	⬇️
gotham/src/test/async_test.rs	67.74% <0.00%> (-5.95%)	⬇️
gotham/src/plain/mod.rs	81.25% <0.00%> (-5.42%)	⬇️
gotham/src/state/request_id.rs	95.00% <0.00%> (-5.00%)	⬇️
... and 32 more

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