Commits on Jul 29, 2019

1. 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 2.3 (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.

   

   brandur committed Jul 29, 2019
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