Log message:
devel/ruby-regexp_parser: update to 1.7.0

Update ruby-regexp_parser to 1.7.0.

### [1.7.0] - 2020-02-23 - [Janosch Müller](mailto:janosch84@gmail.com)

### Added

- `Expression#each_expression` and `1.#traverse` can now be called without a block
  * this returns an `Enumerator` and allows chaining, e.g. `each_expression.select`
  * thanks to [Masataka Kuwabara](https://github.com/pocke)

### Fixed

- `MatchLength#each` no longer ignores the given `limit:` when called without a block

Log message:
devel/ruby-regexp_parser: add version 1.6.0 package

Add ruby-regexp_parser version 1.6.0 package.

# Regexp::Parser

A Ruby gem for tokenizing, parsing, and transforming regular expressions.

* Multilayered

  * A scanner/tokenizer based on [Ragel](http://www.colm.net/open-source/ragel/)
  * A lexer that produces a "stream" of token objects.
  * A parser that produces a "tree" of Expression objects (OO API)

* Runs on Ruby 1.9, 2.x, and JRuby (1.9 mode) runtimes.

* Recognizes Ruby 1.8, 1.9, and 2.x regular expressions.