0.3.0

[RobDWaller]

This PR finishes the 0.3.0 refresh of the Atlantic City WordPress plugin.

• Moves CI from Travis to GitHub Actions.
• Updates license information.
• Ignores Docker configuration files.

[codecov-io]

Codecov Report

Merging #5 (8c56cd9) into master (a4cf321) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##              master        #5   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity         8         8           
===========================================
  Files              1         1           
  Lines             22        22           
===========================================
  Hits              22        22           

Impacted Files	Coverage Δ	Complexity Δ
src/AtlanticCity.php	100.00% <100.00%> (ø)	8.00 <0.00> (ø)

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