Allow PEP links with anchors (#116)

* Allow PEP links with anchors

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Sorin Sbarnea <ssbarnea@redhat.com>

src/doc8/checks.py

@@ -118,6 +118,9 @@ class CheckValidity(ContentCheck):
             r'^Error in \"code-block\" directive\:\nunknown option: "substitutions".',
             re.MULTILINE,
         ),
+        re.compile(
+            r'^PEP number must be a number from 0 to 9999; "\d{1,4}#[^"]*" is invalid.'
+        ),
     ]
 
     def __init__(self, cfg):