Update Mux to be compatible with HTTP 0.8.

[tkoolen]

With MeshCat deved, I was getting the following:

using MeshCat

WARNING: could not import HTTP.HandlerFunction into Mux
ERROR: LoadError: LoadError: UndefVarError: Server not defined
Stacktrace:
 [1] top-level scope at none:0
 [2] include at ./boot.jl:326 [inlined]
 [3] include_relative(::Module, ::String) at ./loading.jl:1038
 [4] include at ./sysimg.jl:29 [inlined]
 [5] include(::String) at /home/twan/.julia/packages/Mux/11dSG/src/Mux.jl:1
 [6] top-level scope at none:0
 [7] include at ./boot.jl:326 [inlined]
 [8] include_relative(::Module, ::String) at ./loading.jl:1038
 [9] include(::Module, ::String) at ./sysimg.jl:29
 [10] top-level scope at none:2
 [11] eval at ./boot.jl:328 [inlined]
 [12] eval(::Expr) at ./client.jl:404
 [13] top-level scope at ./none:3
in expression starting at /home/twan/.julia/packages/Mux/11dSG/src/server.jl:56
in expression starting at /home/twan/.julia/packages/Mux/11dSG/src/Mux.jl:24
ERROR: LoadError: Failed to precompile Mux [a975b10e-0019-58db-a62f-e48ff68538c9] to /home/twan/.julia/compiled/v1.1/Mux/cs9xb.ji.
Stacktrace:
 [1] error(::String) at ./error.jl:33
 [2] compilecache(::Base.PkgId, ::String) at ./loading.jl:1197
 [3] _require(::Base.PkgId) at ./loading.jl:960
 [4] require(::Base.PkgId) at ./loading.jl:858
 [5] require(::Module, ::Symbol) at ./loading.jl:853
 [6] include at ./boot.jl:326 [inlined]
 [7] include_relative(::Module, ::String) at ./loading.jl:1038
 [8] include(::Module, ::String) at ./sysimg.jl:29
 [9] top-level scope at none:2
 [10] eval at ./boot.jl:328 [inlined]
 [11] eval(::Expr) at ./client.jl:404
 [12] top-level scope at ./none:3
in expression starting at /home/twan/.julia/dev/MeshCat/src/MeshCat.jl:6

Failed to precompile MeshCat [283c5d60-a78f-5afe-a0af-af636b173e11] to /home/twan/.julia/compiled/v1.1/MeshCat/CZdjb.ji.

Stacktrace:
 [1] error(::String) at ./error.jl:33
 [2] compilecache(::Base.PkgId, ::String) at ./loading.jl:1197
 [3] _require(::Base.PkgId) at ./loading.jl:960
 [4] require(::Base.PkgId) at ./loading.jl:858
 [5] require(::Module, ::Symbol) at ./loading.jl:853
 [6] top-level scope at In[2]:1

This is because Mux 0.5.3 (the latest 0.5.x version) is not compatible with HTTP 0.8, but Mux has not specified upper bounds on its HTTP compatibility.

[codecov-io]

Codecov Report

Merging #96 into master will increase coverage by 3.68%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master     #96      +/-   ##
=========================================
+ Coverage   69.52%   73.2%   +3.68%     
=========================================
  Files          12      12              
  Lines         338     321      -17     
=========================================
  Hits          235     235              
+ Misses        103      86      -17

Impacted Files	Coverage Δ
src/servers.jl	4.54% <0%> (+0.37%)	⬆️
src/MeshCat.jl	30.43% <0%> (+2.43%)	⬆️
src/lowering.jl	83.33% <0%> (+2.45%)	⬆️
src/objects.jl	100% <0%> (+3.84%)	⬆️
src/visualizer.jl	74.64% <0%> (+9.21%)	⬆️

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[dehann]

HI @tkoolen thanks! FYI, I also ran into this yesterday and was able to get Mux#master to work with HTTP 0.8. There is a fix and open issue on Mux to tag a new release -- looks like it could happen soon.

[tkoolen]

Should be merged already, JuliaLang/METADATA.jl#22382 / https://github.com/JuliaWeb/Mux.jl/releases/tag/v0.7.0.

[rdeits]

Thank you!