Add Ruby 2.7.3 and 3.0.1 to the test matrix

[rymai]

No description provided.

[codecov]

Codecov Report

Merging #969 (168e18b) into master (24e865c) will increase coverage by 1.03%.
The diff coverage is 100.00%.

❗ Current head 168e18b differs from pull request most recent head c3363e7. Consider uploading reports for the commit c3363e7 to get more accurate results

@@            Coverage Diff             @@
##           master     #969      +/-   ##
==========================================
+ Coverage   88.69%   89.72%   +1.03%     
==========================================
  Files          58       58              
  Lines        2008     1957      -51     
==========================================
- Hits         1781     1756      -25     
+ Misses        227      201      -26     

Impacted Files	Coverage Δ
lib/guard/plugin_util.rb	91.66% <100.00%> (ø)
lib/guard/cli.rb	92.45% <0.00%> (-3.78%)	⬇️
lib/guard/deprecated/options.rb	85.71% <0.00%> (-1.39%)	⬇️
lib/guard/internals/scope.rb	54.68% <0.00%> (-0.70%)	⬇️
lib/guard/jobs/pry_wrapper.rb	80.12% <0.00%> (-0.13%)	⬇️
lib/guard/plugin.rb	97.87% <0.00%> (-0.05%)	⬇️
lib/guard/dsl.rb	99.07% <0.00%> (-0.01%)	⬇️
lib/guard/internals/session.rb	94.31% <0.00%> (+1.05%)	⬆️
lib/guard/dsl_describer.rb	98.63% <0.00%> (+1.29%)	⬆️
lib/guard/guardfile/evaluator.rb	100.00% <0.00%> (+1.49%)	⬆️
... and 7 more

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