[ruby/ipaddr] Prefer String#start_with? over Regexp.match

https://github.com/ruby/ipaddr/commit/054fe12ec4

lib/ipaddr.rb

@@ -674,7 +674,7 @@ class IPAddr
     end
     octets.inject(0) { |i, s|
       (n = s.to_i) < 256 or raise InvalidAddressError, "invalid address: #{@addr}"
-      s.match(/\A0./) and raise InvalidAddressError, "zero-filled number in IPv4 address is ambiguous: #{@addr}"
+      (s != '0') && s.start_with?('0') and raise InvalidAddressError, "zero-filled number in IPv4 address is ambiguous: #{@addr}"
       i << 8 | n
     }
   end