Documentation: missing a `

[akimd]

https://github.com/whitequark/ast/blob/fcb9b91735eebf7d26b64a9767974d760958f364/lib/ast/processor/mixin.rb#L26

Cheers.

[akimd]

While at it, please note that the documentation on Github (http://whitequark.github.io/ast/frames.html) is obsolete (it still recommends subclassing the Processor for instance).

[whitequark]

Doc updated.