Update CI

[kescobo]

1. Changed CI to run on 1.0, current LTS, current release, and nightly, instead of weird smattering of versions.
2. Removed a redundant CompatHelper action

[codecov]

Codecov Report

Base: 86.24% // Head: 86.27% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (24ec353) compared to base (6683ecf).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #127      +/-   ##
==========================================
+ Coverage   86.24%   86.27%   +0.03%     
==========================================
  Files          12       12              
  Lines        1534     1625      +91     
==========================================
+ Hits         1323     1402      +79     
- Misses        211      223      +12     

Impacted Files	Coverage Δ
src/scanner.jl	84.34% <0.00%> (-0.18%)	⬇️
src/YAML.jl	94.44% <0.00%> (-0.16%)	⬇️
src/queue.jl	100.00% <0.00%> (ø)
src/resolver.jl	100.00% <0.00%> (ø)
src/parser.jl	83.56% <0.00%> (+0.04%)	⬆️
src/writer.jl	98.21% <0.00%> (+0.13%)	⬆️
src/composer.jl	91.20% <0.00%> (+0.19%)	⬆️
src/buffered_input.jl	97.14% <0.00%> (+0.36%)	⬆️
src/constructor.jl	86.01% <0.00%> (+0.60%)	⬆️

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