Use $ instead of \Z for end of string

They're identical here, since re.M is not used, and the better-known
should be used, for readability.

bookwyrm/views/status.py

@@ -323,7 +323,7 @@ def format_links(content):
 
 def _unwrap(text):
     """split surrounding brackets and trailing punctuation from a string of text"""
-    punct = re.compile(r'([.,;:!?"’”»]+)\Z')
+    punct = re.compile(r'([.,;:!?"’”»]+)$')
     prefix = suffix = ""
 
     if punct.search(text):