[ANN] sexp_processor 4.13.0 Released

sexp_processor version 4.13.0 has been released!

* home: <https://github.com/seattlerb/sexp_processor>
* rdoc: <http://docs.seattlerb.org/sexp_processor>

sexp_processor branches from ParseTree bringing all the generic sexp
processing tools with it. Sexp, SexpProcessor, Environment, etc... all
for your language processing pleasure.

Changes:

### 4.13.0 / 2019-09-24

* 4 minor enhancements:

  * Added Sexp.q (query) and deprecated Sexp.s to distinguish better and match inspect output.
  * Extended Sexp::Matcher::Parser to allow `not?` patterns.
  * Extended Sexp::Matcher::Parser to cover more method names.
  * Split out all pattern-oriented code to sexp_matcher.rb.

* 1 bug fix:

  * Fixed bug w/ ruby's Array#eql? and #hash not looking at ivars.

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