Use isdecimal() instead of isdigit() (#352)

Author: elliotwutingfeng

tldextract/remote.py

@@ -55,7 +55,7 @@ def _schemeless_url(url: str) -> str:
 
 def looks_like_ip(maybe_ip: str) -> bool:
     """Check whether the given str looks like an IPv4 address."""
-    if not maybe_ip[0].isdigit():
+    if not maybe_ip[0].isdecimal():
         return False
 
     return IP_RE.fullmatch(maybe_ip) is not None