0.3.0

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](https://github.com/BurntSushi/ripgrep/pull/233)
  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](https://github.com/BurntSushi/ripgrep/pull/233)
  for argument parsing.
  [This may get fixed in the
  future.](https://github.com/kbknapp/clap-rs/issues/742).

Performance improvements:

* [PERF #33](https://github.com/BurntSushi/ripgrep/issues/33):
  ripgrep now performs similar to GNU grep on small corpora.
* [PERF #136](https://github.com/BurntSushi/ripgrep/issues/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](https://github.com/BurntSushi/ripgrep/issues/7):
  Add a `-f/--file` flag that causes ripgrep to read patterns from a file.
* [FEATURE #51](https://github.com/BurntSushi/ripgrep/issues/51):
  Add a `--colors` flag that enables one to customize the colors used in
  ripgrep's output.
* [FEATURE #138](https://github.com/BurntSushi/ripgrep/issues/138):
  Add a `--files-without-match` flag that shows only file paths that contain
  zero matches.
* [FEATURE #230](https://github.com/BurntSushi/ripgrep/issues/230):
  Add completion files to the release (Bash, Fish and PowerShell).

Bug fixes:

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