Use New JuMP Macro API

[pulsipher]

This tries out https://github.com/jump-dev/JuMP.jl/pull/3620 as a proof of concept.

cc @odow

[codecov[bot]]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (ad13a33) 99.76% compared to head (f78eabe) 99.74%.

Files	Patch %	Lines
src/macros.jl	98.79%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #334 +/- ## ========================================== - Coverage 99.76% 99.74% -0.02% ========================================== Files 36 36 Lines 6680 6589 -91 ========================================== - Hits 6664 6572 -92 - Misses 16 17 +1 ```

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[odow]

The 1.6 failure is our fault, because we don't have <0.0.1 here: https://github.com/jump-dev/JuMP.jl/blob/5b1a53f0a5adb7028ec2356f6239657a21475891/Project.toml#L24

[pulsipher]

The 1.6 failure is our fault, because we don't have <0.0.1 here: https://github.com/jump-dev/JuMP.jl/blob/5b1a53f0a5adb7028ec2356f6239657a21475891/Project.toml#L24

Ok, I'll wait for the fix then.

[odow]

Ok, I'll wait for the fix then.

It's just because you're using Pkg in the tests. This is a bug in Julia 1.6. When we tag a release of JuMP it'll work.

Edit: I guess it doesn't hurt: https://github.com/jump-dev/JuMP.jl/pull/3626

[odow]

Hopefully fixed, so try re-running the tests.

[pulsipher]

Hopefully fixed, so try re-running the tests.

That seems to have fixed it, thanks!