When returning 404, look for /404/ and /404.html and serve as the response body.

[fredrikekre]

No description provided.

[codecov-commenter]

Codecov Report

Merging #107 into master will increase coverage by 0.60%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #107      +/-   ##
==========================================
+ Coverage   88.53%   89.14%   +0.60%     
==========================================
  Files           4        4              
  Lines         218      221       +3     
==========================================
+ Hits          193      197       +4     
+ Misses         25       24       -1     

Impacted Files	Coverage Δ
src/server.jl	90.90% <100.00%> (+0.38%)	⬆️
src/utils.jl	79.45% <0.00%> (+1.07%)	⬆️

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[tlienart]

Thanks a lot! Lgtm from a quick look, I'll have a second look when I'm on my laptop and will try to merge tomorrow.