Update Rust crate grep to 0.3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
grep (source)	dependencies	minor	0.2 -> 0.3

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Release Notes

BurntSushi/ripgrep (grep)

v0.3.2

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Feature enhancements:

• Added or improved file type filtering for Less, Sass, stylus, Zsh

Bug fixes:

• BUG #​229:
  Make smart case slightly less conservative.
• BUG #​247:
  Clarify use of --heading/--no-heading.
• BUG #​251,
  BUG #​264,
  BUG #​267:
  Fix matching bug caused by literal optimizations.
• BUG #​256:
  Fix bug that caused rg foo and rg foo/ to have different behavior
  when foo was a symlink.
• BUG #​270:
  Fix bug where patterns starting with a - couldn't be used with the
  -e/--regexp flag. (This resolves a regression that was introduced in
  ripgrep 0.3.0.)

v0.3.1

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Bug fixes:

• BUG #​242:
  ripgrep didn't respect --colors foo:none correctly. Now it does.

v0.3.0

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This is a new minor version release of ripgrep that includes two breaking
changes with lots of bug fixes and some new features and performance
improvements. Notably, if you had a problem with colors or piping on Windows
before, then that should now be fixed in this release.

BREAKING CHANGES:

• ripgrep now requires Rust 1.11 to compile. Previously, it could build on
  Rust 1.9. The cause of this was the move from
  Docopt to Clap
  for argument parsing.
• The -e/--regexp flag can no longer accept a pattern starting with a -.
  There are two work-arounds: rg -- -foo and rg [-]foo or rg -e [-]foo
  will all search for the same -foo pattern. The cause of this was the move
  from Docopt to Clap
  for argument parsing.
  This may get fixed in the
  future..

Performance improvements:

• PERF #​33:
  ripgrep now performs similar to GNU grep on small corpora.
• PERF #​136:
  ripgrep no longer slows down because of argument parsing when given a large
  argument list.

Feature enhancements:

• Added or improved file type filtering for Elixir.
• FEATURE #​7:
  Add a -f/--file flag that causes ripgrep to read patterns from a file.
• FEATURE #​51:
  Add a --colors flag that enables one to customize the colors used in
  ripgrep's output.
• FEATURE #​138:
  Add a --files-without-match flag that shows only file paths that contain
  zero matches.
• FEATURE #​230:
  Add completion files to the release (Bash, Fish and PowerShell).

Bug fixes:

• BUG #​37:
  Use correct ANSI escape sequences when TERM=screen.linux.
• BUG #​94:
  ripgrep now detects stdin on Windows automatically.
• BUG #​117:
  Colors should now work correctly and automatically inside mintty.
• BUG #​182:
  Colors should now work within Emacs. In particular, --color=always will
  emit colors regardless of the current environment.
• BUG #​189:
  Show less content when running rg -h. The full help content can be
  accessed with rg --help.
• BUG #​210:
  Support non-UTF-8 file names on Unix platforms.
• BUG #​231:
  Switch from block buffering to line buffering.
• BUG #​241:
  Some error messages weren't suppressed when --no-messages was used.

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