Support Julia 1.3

[devmotion]

MeshIO holds back GeometryBasics (and hence also GridLayoutBase) in the tests of Makie with Julia 1.3 (MakieOrg/Makie.jl#1244). CI should reveal any potential issues with Julia 1.3 🙂

[codecov]

Codecov Report

Merging #76 (d0a131e) into master (97ce3af) will decrease coverage by 0.27%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #76      +/-   ##
==========================================
- Coverage   93.44%   93.17%   -0.28%     
==========================================
  Files           8        8              
  Lines         412      410       -2     
==========================================
- Hits          385      382       -3     
- Misses         27       28       +1     

Impacted Files	Coverage Δ
src/MeshIO.jl	100.00% <100.00%> (ø)
src/io/obj.jl	96.77% <100.00%> (ø)
src/precompile.jl	0.00% <0.00%> (-27.28%)	⬇️

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[devmotion]

Test errors look similar to JuliaIO/FileIO.jl#345, maybe it's an issue upstream. I'll investigate it more closely when I'm back at my computer.

[devmotion]

Tests pass now with Julia 1.3. The problem was that filter(f, ::Tuple) is not defined in Julia 1.3. I used the opportunity to clean the list of imports and fix the deprecations in the tests as well.

[devmotion]

@SimonDanisch The PR is ready for review 🙂

[SimonDanisch]

Thank you :)