Use JLL package

[helgee]

@giordano Do you think it's fine to just drop pre-1.3 Julia versions here? There are no new features or bug fixes and the old versions will remain functional.

[coveralls]

Pull Request Test Coverage Report for Build 248

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 9 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.2%) to 98.912%

---

Files with Coverage Reduction	New Missed Lines	%
src/d.jl	1	98.37%
src/g.jl	2	96.41%
src/cells.jl	6	83.93%

Totals
Change from base Build 246:	-0.2%
Covered Lines:	2545
Relevant Lines:	2573

---

💛 - Coveralls

[giordano]

Yes, I'm not afraid of removing support for old versions of Julia: they won't enjoy new releases of the package, but the old ones will of course work. I believe the much easier installation and lower maintenance are worth the breakage.

Note that cirrus CI is probably kind of broken. You can just drop it and add freebsd to the operating systems for Travis

[codecov]

Codecov Report

Merging #14 into master will decrease coverage by 0.30%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #14      +/-   ##
==========================================
- Coverage   99.22%   98.91%   -0.31%     
==========================================
  Files          27       27              
  Lines        2568     2573       +5     
==========================================
- Hits         2548     2545       -3     
- Misses         20       28       +8     

Impacted Files	Coverage Δ
src/SPICE.jl	98.43% <ø> (ø)
src/cells.jl	83.92% <0.00%> (-10.42%)	⬇️
src/g.jl	96.41% <0.00%> (-0.88%)	⬇️
src/c.jl	100.00% <0.00%> (ø)
src/d.jl	98.36% <0.00%> (ø)
src/e.jl	99.19% <0.00%> (ø)
src/f.jl	100.00% <0.00%> (ø)
src/h.jl	100.00% <0.00%> (ø)
src/i.jl	100.00% <0.00%> (ø)
src/l.jl	100.00% <0.00%> (ø)
... and 8 more

---

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 e2529fa...2a332b5. Read the comment docs.

[helgee]

In principle it would suffice to test on 1.5 and nightly, right?

[giordano]

I usually test packages with the oldest supported version of Julia (1.3 here) and the latest one (1, which is an alias for the latest stable release in the v1 series)

[giordano]

...in addition to nightly