Update when "direct references" got supported, to reflect reality
@@ -184,7 +184,7 @@ Since version 6.0, pip also supports specifiers containing `environment markers
SomeProject ==5.4 ; python_version < '3.8'
SomeProject; sys_platform == 'win32'
-Since version 19.1, pip also supports `direct references
+Since version 19.3, pip also supports `direct references
<https://www.python.org/dev/peps/pep-0440/#direct-references>`__ like so:
::
