Custom user name watch ^v\w{3,5}\Wkumar$ for SFF

Requested by Mithrandir
https://chat.stackexchange.com/transcript/message/49368820#49368820

findspam.py

@@ -1860,6 +1860,9 @@ def religion_troll(s, site):
 create_rule("bad keyword in {}",
             r'(?i)[\w\s]{0,20}help(?: a)?(?: weak)? postgraduate student(?: to)? write(?: a)? book\??',
             body=False, max_rep=20, max_score=2)
+# Requested by Mithrandir 2019-03-08
+create_rule("potentially bad keyword in {}", r'^v\w{3,5}\Wkumar$',
+            title=False, body=False, username=True, sites=['scifi.stackexchange.com'])
 # Eltima: Nested lookarounds for length limit
 create_rule("bad keyword in {}", r"(?is)(?<=^(?=.{,750}$).*)\beltima",
             title=False, max_rep=50)