textproc/hgrep: update to 0.3.6

- Add -u/--unrestricted flags to built-in ripgrep (ripgrep feature). This flag
  reduces the level of "smart" filtering by repeated uses (up to 2). A single
  flag -u is equivalent to --no-ignore. Two flags -uu are equivalent to
  --no-ignore --hidden. Unlike ripgrep, three flags -uuu are not supported
  since hgrep doesn't support --binary flag.

- Allow command line options to override their previous values. For example,
  hgrep --theme ayu-dark --theme OneHalfDark specifies OneHalfDark theme,
  which previously caused a command line parse error. This new behavior is
  useful when you specify a default option in HGREP_DEFAULT_OPTS and want to
  override the default value in a command line.

- A Debian package (.deb file) is now released in the release page. For
  example the package file for v0.3.6 can be downloaded from this link.
  The package can be installed via dpkg command and managed by APT package
  manager. It installs the man page and bash completion file automatically.
  Please see the document for more details. (#17)

- Fix redundant imports warning reported from a nightly compiler.

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