(IAC-859) add Ruby 2.7 testing; address deprecation warnings

[DavidS]

No description provided.

[codecov-commenter]

Codecov Report

Merging #22 into master will increase coverage by 0.19%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #22      +/-   ##
==========================================
+ Coverage   92.30%   92.50%   +0.19%     
==========================================
  Files           2        2              
  Lines         156      160       +4     
==========================================
+ Hits          144      148       +4     
  Misses         12       12              

Impacted Files	Coverage Δ
lib/puppet/modulebuilder/builder.rb	92.40% <100.00%> (+0.19%)	⬆️

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