Zip library changes related to PR #3341

 - Drop compression_encoding option, it requires PHP 5.4.
 - Change default compression_level to 2 as this was previously the hard-coded default.
 - Improve on the doc changes made in the PR.
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index 08b6921..98026dc 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -423,7 +423,7 @@
    -  :doc:`Zip Library <libraries/zip>` changes include:
 
       - Method ``read_file()`` can now also alter the original file path/name while adding files to an archive.
-      - Added support for changing the compression level and encoding used by gzcompress.
+      - Added support for changing the compression level.
 
    -  :doc:`Trackback Library <libraries/trackback>` method ``receive()`` will now utilize ``iconv()`` if it is available but ``mb_convert_encoding()`` is not.