In particular, explicitly note when to update the CHANGELOG.

Also, tweak the ripgrep introductory message.

This likely originated from a bad copy/paste.

PR #1596 

And in particular, note the special $0 index, which corresponds to the
entire match.

Fixes #1591

Closes #1586, PR #1587 

We use '+++' syntax to output a literal '**' for a '--glob' example.
This '+++' syntax is pretty ugly when rendered literally via --help. We
fix this by hackily inserting the '+++' syntax for its one specific case
that we need it during man page generation.

Not ideal but it works. And --help still has some '*foo*' markup, but we
live with that for now.

Fixes #1581

This also removes Fish shell completions. See #1577 for more details.

Getting the crate order right is important, so document it.

It's just good sense to make sure everything is updated if possible.

No code changes were necessary.

Everything looks pretty minor.

The steps are numerous, subtle and complex enough that it's worth
writing them down. In particular, getting the order correct is
important. (i.e., If we released to crates.io first and the GitHub
release infrastructure failed, then we'd be in a pickle.)

AsciiDoc development is continued under asciidoctor. See
https://github.com/asciidoc/asciidoc.

We do however fallback to a2x if asciidoctor is not present. This is to
ease migration, but at some point, it's likely that support for a2x will
be dropped.

Originally reported downstream:
https://github.com/Homebrew/linuxbrew-core/issues/19885

Closes #1544

Adds `WalkBuilder::filter_entry` that takes a predicate to be applied to
all entries. If the predicate returns `false` on a given entry, that
entry and all children will be skipped.

Fixes #1555, Closes #1557

While Linux distributions (at least Arch Linux, RHEL, Debian) do not support
compressing files with compress(1), macOS & AIX do (the utility is part of
POSIX). Additionally, gzip is able to uncompress such compressed files and
provides an `uncompress` binary.

Closes #1547

It has grown quite long. It would be nice if we could shorten this only
when -h is used and keep it long for --help, but it seems clap doesn't
let this happen. (It does have `about` and `long_about` options, but
they don't work, even when I disable the use of the template.)

The longer prelude is now only available in the man page.

This addresses #189.

Fixes #1252

When a pattern with invalid UTF-8 is given, the error message suggests
unqualified use of hex escape sequences to match arbitrary bytes. But
you *also* need to disable Unicode mode. So include that in the error
message.

Fixes #1339

Fixes #1524

This attempts to fix some mild confusion that came up as part of #1574.
Specifically:
https://github.com/BurntSushi/ripgrep/issues/1574#issuecomment-625780436

This clarifies that persistence is possible via a configuration file.

Fixes #1571