do not accet testnet addresses in bitcoin.is_address

lib/bitcoin.py

@@ -352,11 +352,14 @@ def is_valid(addr):
 
 def is_address(addr):
     ADDRESS_RE = re.compile('[1-9A-HJ-NP-Za-km-z]{26,}\\Z')
-    if not ADDRESS_RE.match(addr): return False
+    if not ADDRESS_RE.match(addr):
+        return False
     try:
         addrtype, h = bc_address_to_hash_160(addr)
     except Exception:
         return False
+    if addrtype != 0:
+        return False
     return addr == hash_160_to_bc_address(h, addrtype)