Add support for 'Metal.jl'? #221

julia> import Pkg; Pkg.add("Omega")
   Resolving package versions...
ERROR: Unsatisfiable requirements detected for package CUDA [052768ef]:
 CUDA [052768ef] log:
 ├─possible versions are: 0.1.0-3.11.0 or uninstalled
 ├─restricted by julia compatibility requirements to versions: [2.3.0, 2.5.0-3.11.0] or uninstalled
 ├─restricted by compatibility requirements with GPUArrays [0c68f7d7] to versions: 3.3.5-3.11.0 or uninstalled
 │ └─GPUArrays [0c68f7d7] log:
 │   ├─possible versions are: 0.3.0-8.4.0 or uninstalled
 │   └─restricted by compatibility requirements with Metal [dde4c033] to versions: 8.4.0
 │     └─Metal [dde4c033] log:
 │       ├─possible versions are: 0.0.1-0.1.0 or uninstalled
 │       └─restricted to versions * by an explicit requirement, leaving only versions 0.0.1-0.1.0
 └─restricted by compatibility requirements with Flux [587475ba] to versions: 2.1.0-2.6.3 — no versions left
   └─Flux [587475ba] log:
     ├─possible versions are: 0.4.1-0.13.3 or uninstalled
     ├─restricted by compatibility requirements with Omega [1af16e33] to versions: 0.4.1-0.11.6
     │ └─Omega [1af16e33] log:
     │   ├─possible versions are: 0.1.0-0.1.1 or uninstalled
     │   └─restricted to versions * by an explicit requirement, leaving only versions 0.1.0-0.1.1
     ├─restricted by compatibility requirements with CuArrays [3a865a2d] to versions: [0.4.1-0.8.3, 0.11.0-0.13.3] or uninstalled, leaving only versions: [0.4.1-0.8.3, 0.11.0-0.11.6]
     │ └─CuArrays [3a865a2d] log:
     │   ├─possible versions are: 0.2.1-2.2.2 or uninstalled
     │   └─restricted by julia compatibility requirements to versions: uninstalled
     ├─restricted by compatibility requirements with Reexport [189a3867] to versions: [0.4.1, 0.11.6-0.13.3] or uninstalled, leaving only versions: [0.4.1, 0.11.6]
     │ └─Reexport [189a3867] log:
     │   ├─possible versions are: 0.2.0-1.2.2 or uninstalled
     │   └─restricted by compatibility requirements with Metal [dde4c033] to versions: 1.0.0-1.2.2
     │     └─Metal [dde4c033] log: see above
     └─restricted by compatibility requirements with Colors [5ae59095] to versions: 0.10.4-0.13.3 or uninstalled, leaving only versions: 0.11.6
       └─Colors [5ae59095] log:
         ├─possible versions are: 0.9.0-0.12.8 or uninstalled
         ├─restricted by compatibility requirements with Reexport [189a3867] to versions: 0.12.6-0.12.8 or uninstalled
         │ └─Reexport [189a3867] log: see above
         └─restricted by compatibility requirements with Flux [587475ba] to versions: 0.12.0-0.12.8, leaving only versions: 0.12.6-0.12.8
           └─Flux [587475ba] log: see above
Stacktrace:
  [1] propagate_constraints!(graph::Pkg.Resolve.Graph, sources::Set{Int64}; log_events::Bool)
    @ Pkg.Resolve ~/julia/usr/share/julia/stdlib/v1.8/Pkg/src/Resolve/graphtype.jl:1068
  [2] propagate_constraints! (repeats 2 times)
    @ ~/julia/usr/share/julia/stdlib/v1.8/Pkg/src/Resolve/graphtype.jl:1004 [inlined]
  [3] simplify_graph!(graph::Pkg.Resolve.Graph, sources::Set{Int64}; clean_graph::Bool)
    @ Pkg.Resolve ~/julia/usr/share/julia/stdlib/v1.8/Pkg/src/Resolve/graphtype.jl:1524
  [4] simplify_graph! (repeats 2 times)
    @ ~/julia/usr/share/julia/stdlib/v1.8/Pkg/src/Resolve/graphtype.jl:1523 [inlined]
  [5] resolve_versions!(env::Pkg.Types.EnvCache, registries::Vector{Pkg.Registry.RegistryInstance}, pkgs::Vector{Pkg.Types.PackageSpec}, julia_version::VersionNumber)
    @ Pkg.Operations ~/julia/usr/share/julia/stdlib/v1.8/Pkg/src/Operations.jl:352
  [6] targeted_resolve(env::Pkg.Types.EnvCache, registries::Vector{Pkg.Registry.RegistryInstance}, pkgs::Vector{Pkg.Types.PackageSpec}, preserve::Pkg.Types.PreserveLevel, julia_version::VersionNumber)
    @ Pkg.Operations ~/julia/usr/share/julia/stdlib/v1.8/Pkg/src/Operations.jl:1234
  [7] tiered_resolve(env::Pkg.Types.EnvCache, registries::Vector{Pkg.Registry.RegistryInstance}, pkgs::Vector{Pkg.Types.PackageSpec}, julia_version::VersionNumber)
    @ Pkg.Operations ~/julia/usr/share/julia/stdlib/v1.8/Pkg/src/Operations.jl:1219
  [8] _resolve(io::Base.TTY, env::Pkg.Types.EnvCache, registries::Vector{Pkg.Registry.RegistryInstance}, pkgs::Vector{Pkg.Types.PackageSpec}, preserve::Pkg.Types.PreserveLevel, julia_version::VersionNumber)
    @ Pkg.Operations ~/julia/usr/share/julia/stdlib/v1.8/Pkg/src/Operations.jl:1240
  [9] add(ctx::Pkg.Types.Context, pkgs::Vector{Pkg.Types.PackageSpec}, new_git::Set{Base.UUID}; preserve::Pkg.Types.PreserveLevel, platform::Base.BinaryPlatforms.Platform)
    @ Pkg.Operations ~/julia/usr/share/julia/stdlib/v1.8/Pkg/src/Operations.jl:1256
 [10] add(ctx::Pkg.Types.Context, pkgs::Vector{Pkg.Types.PackageSpec}; preserve::Pkg.Types.PreserveLevel, platform::Base.BinaryPlatforms.Platform, kwargs::Base.Pairs{Symbol, Base.TTY, Tuple{Symbol}, NamedTuple{(:io,), Tuple{Base.TTY}}})
    @ Pkg.API ~/julia/usr/share/julia/stdlib/v1.8/Pkg/src/API.jl:275
 [11] add(pkgs::Vector{Pkg.Types.PackageSpec}; io::Base.TTY, kwargs::Base.Pairs{Symbol, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
    @ Pkg.API ~/julia/usr/share/julia/stdlib/v1.8/Pkg/src/API.jl:156
 [12] add(pkgs::Vector{Pkg.Types.PackageSpec})
    @ Pkg.API ~/julia/usr/share/julia/stdlib/v1.8/Pkg/src/API.jl:145
 [13] #add#27
    @ ~/julia/usr/share/julia/stdlib/v1.8/Pkg/src/API.jl:144 [inlined]
 [14] add
    @ ~/julia/usr/share/julia/stdlib/v1.8/Pkg/src/API.jl:144 [inlined]
 [15] #add#26
    @ ~/julia/usr/share/julia/stdlib/v1.8/Pkg/src/API.jl:143 [inlined]
 [16] add(pkg::String)
    @ Pkg.API ~/julia/usr/share/julia/stdlib/v1.8/Pkg/src/API.jl:143
 [17] top-level scope
    @ REPL[24]:1
 [18] top-level scope
    @ ~/.julia/packages/Metal/fQowO/src/initialization.jl:25

julia>