stripe / stripe-ruby / 3255

95%

master: 97%

Pull #817

travis-ci

Drop support for old versions of Ruby

Drops support for Ruby 2.1 (EOL March 31, 2017) and 2.2 (EOL March 31,
2018). They're removed from `.travis.yml` and the gemspec and RuboCop
configuration have also been updated to the new lower bound.

Most of the diff here are minor updates to styling as required by
RuboCop:

* String literals are frozen by default, so the `.freeze` we had
  everywhere is now considered redundant.

* We can now use Ruby 1.9 style hash syntax with string keys like `{
  "foo": "bar" }.

* Converted a few heredocs over to use squiggly (leading whitespace
  removed) syntax.

As discussed in Slack, I didn't drop support for Ruby 2.2 (EOL March 31,
2019) as we still have quite a few users on it. As far as I know
dropping it doesn't get us access to any major syntax improvements or
anything, so it's probably not a big deal.

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