escort
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Update ruby version and update deprecated specs to use latest RSpec version.
Update ruby version to 2.4.2 Update RSpec and dependency gems to latest versions. Fix deprecated RSpec code to make tests green again. Add ruby 2.4.2 to Travis-ci. Add gem pry to dev dependencies to ease debugging.
This PR is not perfect, I discovered issues #8 and #9 while fixing the specs. Hopefully, this helped a bit :)