Small leak in makeAddress

[lhoward]

Thanks for the great software. A small leak found with leaks:

   public static func makeAddress(from addr: sockaddr_storage) throws -> Address {
       switch Int32(addr.ss_family) {
       case AF_INET:
           var addr_in = try sockaddr_in.make(from: addr)
           let maxLength = socklen_t(INET_ADDRSTRLEN)
           let buffer = UnsafeMutablePointer<CChar>.allocate(capacity: Int(maxLength))
           try Socket.inet_ntop(AF_INET, &addr_in.sin_addr, buffer, maxLength)
           return .ip4(String(cString: buffer), port: UInt16(addr_in.sin_port).byteSwapped)

       case AF_INET6:
           var addr_in6 = try sockaddr_in6.make(from: addr)
           let maxLength = socklen_t(INET6_ADDRSTRLEN)
           let buffer = UnsafeMutablePointer<CChar>.allocate(capacity: Int(maxLength))
           try Socket.inet_ntop(AF_INET6, &addr_in6.sin6_addr, buffer, maxLength)
           return .ip6(String(cString: buffer), port: UInt16(addr_in6.sin6_port).byteSwapped)
...
    }

buffer is leaked. Should be an easy fix.

[swhitty]

Thank you for reporting this. 🙏🏻

Fixed via #63