Log Message:
textproc/hgrep: update to 0.2.1

-Heuristic algorithm to choose the foreground color of matched regions was
 improved. Now hgrep generates multiple candidates for the foreground color,
 and chooses one of them looking at the color distances from the background
 color.
-Add new Material theme. It is a very popular low-contrast color theme. Try it
 by hgrep --theme Matrial.
-Add new Carbonight theme. It is a minimal monotone color theme. Some people
 feel that too colorful outputs are hard to see. This color theme might fit to
 such people.
-Built-in grep allows K/M/G suffix at --max-filesize option to specify a file
 size easily.
-Built-in grep adds new flag --invert-match for invert matching. It shows lines
 that do not match the given pattern.
-Built-in grep adds new flag --one-file-system. When enabled, the search will
 not cross file system boundaries relative to where it started from.
-Built-in grep adds new short flag-. as alias of long flag --hidden.
-Built-in grep adds new flag --no-unicode which disables Unicode-aware search.
-Built-in grep improves the output from --type-list. Now types are printed in
 bold texts which is easier to see.
-Syntax assets were updated to the latest. They improve some syntax highlight
 detection (for example, vimrc for Vim files) and solve some highlighting
 issues.
-Fix a broken pipe error when hgrep command is piped to a pager command like
 less. This happened when less exits earlier than hgrep command, for example,
 when you immediately quit a pager by q without scrolling the output to the end.
 In the case, hgrep still tried to output the result to stdout even if the pipe
 had already been closed and it caused a broken pipe error. In v0.2.1, hgrep
 correctly ignores such broken pipe errors.
-Fix --no-wrap deprecated flag was not removed at v0.2.0. Use --wrap instead if
 you used the flag.
-Fix checksum of downloaded package via Homebrew on arm64 macOS.
-Fix --type-list flag did not print types when a pattern argument is not given.
-(Dev) Move asset-builder tool directory to assets/builder.
-(Dev) The script to update test snapshots is now 25x faster.
-(Dev) CI job to run clippy and rustfmt is now 6x faster.