More 0.7 updates

[rofinn]

• Add a Project.toml file give the hard switch to Pkg3 in nightly
• Don't use @async when logging to handlers because that appears to be causing tests to fail now.

[codecov[bot]]

Codecov Report

Merging #79 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #79   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           9      9           
  Lines         251    251           
=====================================
  Hits          251    251

Impacted Files	Coverage Δ
src/loggers.jl	100% <100%> (ø)	:arrow_up:

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[rofinn]

I'm not sure why Pkg.build is returning 1 now.

[ararslan]

I'd actually hold off on any Pkg-related changes on 0.7. Enough compatibility shims are in place that things should continue to work as expected without a project file.

[rofinn]

I'd like to have a Project.toml file though, so that I can use instantiate from the cloned repo. Maybe there is a better middle ground though? I noticed that the Comapt Project.toml was renamed.

[ararslan]

Compat's Project.toml file was renamed to effectively disable it since it was causing problems. As I understand it, for everything to work properly with Pkg3, every package in the dependency tree for a given package needs to have a Project.toml file. But since Compat's is disabled, that's kind of a non-starter until it's reinstated, as Compat is used by basically every package that supports 0.7.