Release version 0.22.0

Added
-----
* Add mode "x" for SevenZipFile (#588)
* Add SevenZipFile#namelist method (#600)

Fixed
-----
* Append mode on non-existent files (#604)
* Fix NUMBER encoding of integer when 8 bytes(#591)

Changed
-------
* Minimum required Python version to be Python 3.8 (#601)
* Remove pyannotate from pyproject.toml (#598)

Document
--------
* Update user guide (#596)

README.rst

@@ -90,7 +90,7 @@ Supported algorithms
     but it does **not** guarantee to block all the bad cases.
   * ZStandard and Brotli is not default methods of 7-zip, so these archives are considered
     not to be compatible with original 7-zip on windows/p7zip on linux/mac.
-  * Enhanced Deflate is also known as `DEFLATE64` :sup:`TM` that is a registered trademark of `PKWARE, Inc.`
+  * Enhanced Deflate is also known as ``DEFLATE64`` :sup:`TM` that is a registered trademark of ``PKWARE, Inc.``
   * Enhanced Deflate is tested only on CPython. It is disabled on PyPy.
 
 Not supported algorithms