Update Project.toml and Compat

[itsdfish]

I encountered the following compatibility conflict when using Atom with Turing .9.0 in an otherwise clean environment. One of Turing's developers explained that LNR is only compatible with Compat 2. Would you be able to add a Project.toml file and include Compat 3?

julia> 
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Activating environment at `~/.julia/environments/v1.3/Project.toml`
  Updating registry at `~/.julia/registries/General`
  Updating git-repo `https://github.com/JuliaRegistries/General.git`
 Resolving package versions...
ERROR: LoadError: Unsatisfiable requirements detected for package Compat [34da2185]:
 Compat [34da2185] log:
 ├─possible versions are: [1.0.0-1.0.1, 1.1.0, 1.2.0, 1.3.0, 1.4.0, 1.5.0-1.5.1, 2.0.0, 2.1.0, 2.2.0, 3.0.0, 3.1.0, 3.2.0, 3.3.0-3.3.1, 3.4.0, 3.5.0, 3.6.0] or uninstalled
 ├─restricted by compatibility requirements with DataFrames [a93c6f00] to versions: [2.0.0, 2.1.0, 2.2.0, 3.0.0, 3.1.0, 3.2.0, 3.3.0-3.3.1, 3.4.0, 3.5.0, 3.6.0]
 │ └─DataFrames [a93c6f00] log:
 │   ├─possible versions are: [0.11.7, 0.12.0, 0.13.0-0.13.1, 0.14.0-0.14.1, 0.15.0-0.15.2, 0.16.0, 0.17.0-0.17.1, 0.18.0-0.18.4, 0.19.0-0.19.4, 0.20.0-0.20.2] or uninstalled
 │   └─restricted to versions 0.20.2 by an explicit requirement, leaving only versions 0.20.2
 ├─restricted by compatibility requirements with DistributionsAD [ced4e74d] to versions: 3.6.0
 │ └─DistributionsAD [ced4e74d] log:
 │   ├─possible versions are: [0.1.0-0.1.4, 0.2.0, 0.3.0-0.3.2, 0.4.0] or uninstalled
 │   └─restricted by compatibility requirements with Turing [fce5fe82] to versions: 0.4.0
 │     └─Turing [fce5fe82] log:
 │       ├─possible versions are: [0.5.0-0.5.1, 0.6.0-0.6.2, 0.6.4-0.6.9, 0.6.11-0.6.15, 0.6.17-0.6.19, 0.6.21-0.6.23, 0.7.0-0.7.4, 0.8.0-0.8.3, 0.9.0] or uninstalled
 │       └─restricted to versions 0.9 by ACTRModels [c095b0ea], leaving only versions 0.9.0
 │         └─ACTRModels [c095b0ea] log:
 │           ├─possible versions are: 0.1.0 or uninstalled
 │           └─ACTRModels [c095b0ea] is fixed to version 0.1.0
 └─restricted by compatibility requirements with LNR [7c4cb9fa] to versions: [1.0.0-1.0.1, 1.1.0, 1.2.0, 1.3.0, 1.4.0, 1.5.0-1.5.1, 2.0.0, 2.1.0, 2.2.0] — no versions left
   └─LNR [7c4cb9fa] log:
     ├─possible versions are: 0.2.0 or uninstalled
     └─restricted by compatibility requirements with Atom [c52e3926] to versions: 0.2.0
       └─Atom [c52e3926] log:
         ├─possible versions are: [0.8.0-0.8.8, 0.9.0-0.9.1, 0.10.0-0.10.2, 0.11.0-0.11.3, 0.12.0-0.12.7] or uninstalled
         └─restricted to versions * by an explicit requirement, leaving only versions [0.8.0-0.8.8, 0.9.0-0.9.1, 0.10.0-0.10.2, 0.11.0-0.11.3, 0.12.0-0.12.7]
Stacktrace:
 [1] #propagate_constraints!#61(::Bool, ::typeof(Pkg.GraphType.propagate_constraints!), ::Pkg.GraphType.Graph, ::Set{Int64}) at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.3/Pkg/src/GraphType.jl:1007
 [2] propagate_constraints! at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.3/Pkg/src/GraphType.jl:948 [inlined]
 [3] #simplify_graph!#121(::Bool, ::typeof(Pkg.GraphType.simplify_graph!), ::Pkg.GraphType.Graph, ::Set{Int64}) at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.3/Pkg/src/GraphType.jl:1462
 [4] simplify_graph! at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.3/Pkg/src/GraphType.jl:1462 [inlined] (repeats 2 times)
 [5] resolve_versions!(::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}) at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.3/Pkg/src/Operations.jl:321
 [6] #add#112(::Bool, ::Pkg.BinaryPlatforms.Linux, ::typeof(Pkg.Operations.add), ::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}, ::Array{Base.UUID,1}) at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.3/Pkg/src/Operations.jl:1010
 [7] #add at ./none:0 [inlined]
 [8] #add#25(::Bool, ::Pkg.BinaryPlatforms.Linux, ::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}, ::typeof(Pkg.API.add), ::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}) at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.3/Pkg/src/API.jl:102
 [9] add(::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}) at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.3/Pkg/src/API.jl:72
 [10] #add#24 at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.3/Pkg/src/API.jl:69 [inlined]
 [11] add at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.3/Pkg/src/API.jl:69 [inlined]
 [12] #add#21 at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.3/Pkg/src/API.jl:67 [inlined]
 [13] add at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.3/Pkg/src/API.jl:67 [inlined]
 [14] #add#20(::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}, ::typeof(Pkg.API.add), ::String) at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.3/Pkg/src/API.jl:66
 [15] add(::String) at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.3/Pkg/src/API.jl:66
 [16] top-level scope at /home/dfish/.atom/packages/julia-client/script/boot_repl.jl:21
 [17] include at ./boot.jl:328 [inlined]
 [18] include_relative(::Module, ::String) at ./loading.jl:1105
 [19] include(::Module, ::String) at ./Base.jl:31
 [20] exec_options(::Base.JLOptions) at ./client.jl:287
 [21] _start() at ./client.jl:460
in expression starting at /home/dfish/.atom/packages/julia-client/script/boot_repl.jl:1