Convert to standardrb (#156)

- I mostly don’t care about this, but there are a couple of things that
  Standard does that I disagree with. They are inherited from Rubocop,
  but Standard fixes many of Rubocop’s nonsense rules.

  - Array literal wrappers %i[], %w[], etc. are just ugly and never
    should have become any sort of standard. I would be happier if this
    part of standard were just completely disabled, because it‘s
    unnecessary and wrong.

  - Quote literals having to be %q() is equally wrong. I’ve avoided the
    issue here because the generated gemspec uses both "unnecessary"
    quote literals (it’s necessary if I say it’s necessary) and the
    wrong wrappers (I wouldn’t use %q<>, but this is generated code).

- I still think that short hashes can be `{ foo: "bar" }`, but I’m
  mostly using Elixir these days, so I don’t mind `%{foo: "bar"}`, so
  I can get used to it in Ruby. It still feels wrong, almost 20 years
  in.

- There are semantic differences between and / &&, or / ||, but in some
  cases the reformatted code is substantially _worse_ to read. Again,
  I mostly don’t _care_ about this difference, but Rubocop’s insistence
  is silly; these should only be replaced where there _is_ ambiguity.

  - Replacing `x = foo or next` should never be replaced with `(x = foo)
    || next`. That’s replacing something that is somewhat readable with
    something damned-near unreadable. Both should be replaced with:

    ```ruby
    x = foo
    next unless x
    ```

- YAML.safe_load works differently between Psych 2.x and Psych 3.x, so
  some updates have been made to make that work cleanly.

Overall, this introduces a lot of churn, but I think will be easier to
deal with updates to `standardrb` instead of the rapid churn that has
been Rubocop.

1 files changed, 4 insertions, 0 deletions

diff --git a/.standard.yml b/.standard.yml
new file mode 100644
index 0000000..8ae76a7
--- /dev/null
+++ b/.standard.yml
@@ -0,0 +1,4 @@
+parallel: true
+ruby_version: 2.0
+ignore:
+  - 'mime-types.gemspec'