Adding upstream version 1.11.

Signed-off-by: Daniel Baumann <daniel@debian.org>

README

@@ -11,7 +11,7 @@ programs. In particular the option '--recursive' is very efficient in
 those utilities supporting it.
 
 The utilities provided are zcat, zcmp, zdiff, zgrep, ztest, and zupdate.
-The formats supported are bzip2, gzip, lzip, and xz.
+The formats supported are bzip2, gzip, lzip, xz, and zstd.
 Zutils uses external compressors. The compressor to be used for each format
 is configurable at runtime.
 
@@ -21,11 +21,14 @@ gzip's znew.
 
 NOTE: Bzip2 and lzip provide well-defined values of exit status, which makes
 them safe to use with zutils. Gzip and xz may return ambiguous warning
-values, making them less reliable back ends for zutils.
+values, making them less reliable back ends for zutils. Zstd currently does
+not even document its exit status in its man page.
 
 FORMAT NOTE 1: The option '--format' allows the processing of a subset
-of formats in recursive mode and when trying compressed file names:
-'zgrep foo -r --format=bz2,lz somedir somefile.tar'.
+of formats in recursive mode and when trying compressed file names. For
+example, use the following command to search for the string 'foo' in
+gzip and lzip files only:
+'zgrep foo -r --format=gz,lz somedir somefile.tar'.
 
 FORMAT NOTE 2: If the option '--force-format' is given, the files are
 passed to the corresponding decompressor without verifying their format,
@@ -37,7 +40,7 @@ been compressed. Decompressed is used to refer to data which have undergone
 the process of decompression.
 
 
-Copyright (C) 2009-2021 Antonio Diaz Diaz.
+Copyright (C) 2009-2022 Antonio Diaz Diaz.
 
 This file is free documentation: you have unlimited permission to copy,
 distribute, and modify it.