Item13883: Add a missing but optional dependency

core/lib/Foswiki/Contrib/core/DEPENDENCIES

@@ -5,6 +5,7 @@ Authen::SASL,>=2.00,cpan,Optional, required for sending mail with Net::SMTP when
 CGI,>=3.15,cpan,Required, for base Foswiki (Versions 2.89, 3.37, 3.43, 3.47 and 4.11-13 should be avoided for I18N. Most version from 3.15 and onwards should work. Note: As of perl 5.19.7, CGI is no longer shipped with perl core and must be installed using CPAN.)
 CGI::Cookie,>=1.24,cpan,Required, Installs as part of CGI.
 CGI::Session,>=4.30,cpan,Required, for configure and Sessions support, available from the CPAN archive.
+Compress::Zlib,>0, cpan, Optional, used if Cache compression is enabled.
 DBI,>=0,cpan,Optional Foswiki Page Cache
 DBD::mysql,>=0,cpan,Optional Foswiki Page Cache using MySQL
 DBD::Pg,>=0,cpan,Optional Foswiki Page Cache using PostgreSQL