correct Julia minimum version to ≥ 1.6

[stevengj]

Your Project.toml currently lists julia = "1", but in my testing it seems that it requires Julia 1.6+ (and your CI tests also require 1.6+).

In particular, you depend on MicroMamba.jl, which also requires Julia 1.6+. But if you try to install PythonCall on an earlier Julia version, it just pulls in an earlier version of MicroMamba (before this commit).

On earlier versions of Julia, I get errors like:

julia> using PythonCall
[ Info: Precompiling PythonCall [6099a3de-0909-46bc-b1f4-468b9a2dfc0d]
    CondaPkg Found dependencies: /Users/stevenj/.julia/packages/PythonCall/B5irB/CondaPkg.toml
  MicroMamba Downloading: https://micro.mamba.pm/api/micromamba/osx-64/latest
  MicroMamba Installing: /Users/stevenj/.julia/scratchspaces/0b3b1443-0f03-428d-bdfb-f27f9c1191ea/install/micromamba
ERROR: InitError: /Users/stevenj/.julia/scratchspaces/0b3b1443-0f03-428d-bdfb-f27f9c1191ea/install/micromamba does not seem to be a MicroMamba executable
Stacktrace:
 [1] error(::String) at ./error.jl:33
 [2] executable(; io::Base.TTY) at /Users/stevenj/.julia/packages/MicroMamba/lsDkG/src/MicroMamba.jl:127
 [3] cmd(; io::Base.TTY) at /Users/stevenj/.julia/packages/MicroMamba/lsDkG/src/MicroMamba.jl:202
 [4] #cmd#13 at /Users/stevenj/.julia/packages/MicroMamba/lsDkG/src/MicroMamba.jl:209 [inlined]
 [5] _resolve_conda_create(::Base.TTY, ::String, ::Array{CondaPkg.PkgSpec,1}, ::Array{String,1}) at /Users/stevenj/.julia/packages/CondaPkg/qEpDY/src/CondaPkg.jl:281
 [6] resolve(; force::Bool, io::Base.TTY) at /Users/stevenj/.julia/packages/CondaPkg/qEpDY/src/CondaPkg.jl:375
 [7] resolve() at /Users/stevenj/.julia/packages/CondaPkg/qEpDY/src/CondaPkg.jl:327
 [8] envdir at /Users/stevenj/.julia/packages/CondaPkg/qEpDY/src/CondaPkg.jl:482 [inlined]
 [9] init_context() at /Users/stevenj/.julia/packages/PythonCall/B5irB/src/cpython/context.jl:54
 [10] __init__() at /Users/stevenj/.julia/packages/PythonCall/B5irB/src/cpython/CPython.jl:20
 [11] _include_from_serialized(::String, ::Array{Any,1}) at ./loading.jl:697
 [12] _require_from_serialized(::String) at ./loading.jl:749
 [13] _require(::Base.PkgId) at ./loading.jl:1040
 [14] require(::Base.PkgId) at ./loading.jl:928
 [15] require(::Module, ::Symbol) at ./loading.jl:923

[codecov]

Codecov Report

Merging #155 (8ee148f) into main (b4528b7) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #155   +/-   ##
=======================================
  Coverage   29.01%   29.01%           
=======================================
  Files          70       70           
  Lines        4012     4012           
=======================================
  Hits         1164     1164           
  Misses       2848     2848           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b4528b7...8ee148f. Read the comment docs.

[cjdoris]

Great thanks!