Always require GTFS+ yml on config init

[landonreed]

Checklist

• Appropriate branch selected (all PRs must first be merged to dev before they can be merged to master)
• Any modified or new methods or classes have helpful JSDoc and code is thoroughly commented
• The description lists all applicable issues this PR seeks to resolve
• The description lists any configuration setting(s) that differ from the default settings
• All tests and CI builds passing

Description

Fix #486 by always requiring GTFS+ yml.

[codecov-io]

Codecov Report

Merging #487 into dev will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              dev     #487      +/-   ##
==========================================
+ Coverage   16.27%   16.28%   +<.01%     
==========================================
  Files         309      309              
  Lines       15308    15307       -1     
  Branches     4666     4665       -1     
==========================================
+ Hits         2492     2493       +1     
+ Misses      10954    10952       -2     
  Partials     1862     1862

Flag	Coverage Δ
#unit_tests	16.28% <100%> (ø)	⬆️

Impacted Files	Coverage Δ
lib/common/util/config.js	70.9% <100%> (+3.05%)	⬆️

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[landonreed]

🎉 This PR is included in version 4.1.0 🎉

The release is available on GitHub release

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