Updates macros to Julia 1.6 macro scoping

[andreasnoack]

This should make tests pass on 1.6.

Enable testing on latest release

[codecov-io]

Codecov Report

Merging #274 (ed74459) into master (3480c39) will increase coverage by 0.39%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #274      +/-   ##
==========================================
+ Coverage   48.88%   49.28%   +0.39%     
==========================================
  Files          12       12              
  Lines         315      351      +36     
==========================================
+ Hits          154      173      +19     
- Misses        161      178      +17     

Impacted Files	Coverage Δ
src/AtomShell/window.jl	43.20% <100.00%> (+1.87%)	⬆️
src/rpc/rpc.jl	75.00% <100.00%> (+2.77%)	⬆️
src/AtomShell/process.jl	64.91% <0.00%> (-9.56%)	⬇️
src/content/server.jl	72.72% <0.00%> (-1.64%)	⬇️
src/AtomShell/install.jl	4.87% <0.00%> (-0.13%)	⬇️
src/rpc/callbacks.jl	92.85% <0.00%> (+0.54%)	⬆️
src/content/api.jl	14.28% <0.00%> (+0.64%)	⬆️
src/content/content.jl	90.90% <0.00%> (+2.02%)	⬆️
... and 1 more

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[andreasnoack]

Would be great with a release if possible.

[pfitzseb]

JuliaRegistries/General#27836