Add Project.toml for new Julia Registrator package flow

[non-Jedi]

Since packages new register directly to the General repo, a
Project.toml will be needed before Gadfly's next release.

[codecov-io]

Codecov Report

Merging #1277 into master will decrease coverage by 4.24%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1277      +/-   ##
==========================================
- Coverage   90.08%   85.83%   -4.25%     
==========================================
  Files          36       36              
  Lines        3953     4159     +206     
==========================================
+ Hits         3561     3570       +9     
- Misses        392      589     +197

Impacted Files	Coverage Δ
src/geom/beeswarm.jl	78.75% <0%> (-13.9%)	⬇️
src/ticks.jl	80.57% <0%> (-11.23%)	⬇️
src/bincount.jl	84.53% <0%> (-10.82%)	⬇️
src/geom/rectbin.jl	77.77% <0%> (-9.73%)	⬇️
src/poetry.jl	88.88% <0%> (-7.12%)	⬇️
src/geom/label.jl	92.52% <0%> (-6.48%)	⬇️
src/statistics.jl	90.81% <0%> (-6.03%)	⬇️
src/geom/subplot.jl	90.44% <0%> (-4.86%)	⬇️
src/dataframes.jl	85.71% <0%> (-4.86%)	⬇️
src/scale.jl	93.38% <0%> (-4.03%)	⬇️
... and 14 more

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[bjarthur]

are we supposed to delete REQUIRE too?

isn't there supposed to be a version number in Project.toml? cf 1, 2, 3, 4, 5

did you use this tool to generate it? or this one?

[non-Jedi]

• REQUIRE can certainly be deleted (but doesn't need to be); you're right.
• I did not add a version number because I'm not sure if next release will be 1.1.0 or 1.0.1. One will be needed before next release.
• I don't think I used a tool. This is the Project.toml that's been sitting around on my computer for the past few months for practical reasons in the Gadfly repository; pretty sure I just generated it by hand so that I could have a clean environment for Gadfly development.

[non-Jedi]

The other thing we should talk about if whether we want to start
following the "best practice" of doing some rudimentary dependency
pinning (as is the default for the compat section of
Project.toml). Since Gadfly is post-1.0 now it seems like it shouldn't
just be assumed that either we're compatible with all versions of a
package or that we're compatible with all versions greater than some
number. Should we cap version numbers to current minor version for
pre-1.0 packages and current major version for post? e.g.

[compat]
Colors = "0.3.4, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9"

[bjarthur]

there are new features, not just bug fixes, so let's go with 1.1.

should add test/Project.toml too and delete test/REQUIRE

version pinning seem reasonable. this script might do that. would be good to compare it's output with yours anyway.

[non-Jedi]

That script generated a file identical to mine with the exception that
it has a different uuid for the Statistics package; which makes me
wonder if mine is correct. Could you run the tests using the
Project.toml from this PR and confirm that it works for you?

cd("Gadfly.jl")
import Pkg
Pkg.activate(".")
Pkg.instantiate()
Pkg.test()

[non-Jedi]

I've moved test/REQUIRE into the Project.toml file under [targets] and [extras] as described in the Pkg.jl manual. I also added Julia 0.7 and Julia 1.1 to the CI tests since we're claiming to support them. Versions have been pinned (manually; the script did not pin versions). I think this is ready to go once CI passes. The Statistics uuid seems to be correct since CI found it without any problems.

[bjarthur]

looks great. two things:

could you please squash your first two commits so as not to clutter the git log.

your uuid for Statistics matches mine and the one in the julia stdlib. would be good though to get a firm answer on why @StefanKarpinski 's script is returning a different one. perhaps submit an issue to Pkg.jl?

[non-Jedi]

Done. Statistics uuid issue was corrected since I downloaded the script: JuliaLang/Pkg.jl#1138.