Fix regex syntax #2686

This was triggering a FutureWarning

Reported-by: Thorsten Godau @tgodau
Signed-off-by: Philippe Ombredanne <[email protected]>

Author: pombredanne

src/cluecode/copyrights.py

@@ -1590,7 +1590,7 @@ def from_node(
     (r'^[A-Z]+[.][A-Z][a-z]+[,]?$', 'NNP'),
 
     # proper noun with apostrophe ': D'Orleans, D'Arcy, T'so, Ts'o
-    (r"^[A-Z][[a-z]?['][A-Z]?[a-z]+[,.]?$", 'NNP'),
+    (r"^[A-Z][a-z]?['][A-Z]?[a-z]+[,.]?$", 'NNP'),
 
     # proper noun with apostrophe ': d'Itri
     (r"^[a-z]['][A-Z]?[a-z]+[,\.]?$", 'NNP'),