In rails projects, track changes to erb/slim/jbuilder files

[la-magra]

Is your feature request related to a problem? Please describe.

Problem: A developer modifies a view, runs rspec, if the tests are already cached, no tests are run (with the recommended config in https://github.com/avmnu-sng/rspec-tracer#getting-started).

Describe the solution you'd like

If a erb|slim|jbuilder file is modified, their related specs should be invalidated so tests can run again.

Describe alternatives you've considered

Right now, what some do is rm -rf rspec_tracer_cache/*, and run the tests they want, but they have to remember to do so.

Some other rails projects put rspec-tracer behind a environment flag to control when rspec-tracer runs with rspec, but they have to remember to set it.

# ./spec/spec_helper.rb
require 'simplecov'
SimpleCov.start

if ENV['RSPECACHE']
  require 'rspec_tracer'
  RSpecTracer.start
end