add nodl support

[ETeissonniere]

Add support for the nodl coin. Depends on ensdomains/crypto-addr-serialize/pull/11.

[makoto]

Hi.
Your test seems failing even though I locally linked crypto-addr-codec to ensdomains/crypto-addr-serialize#11

  ● NODL

    TypeError: The first argument must be of type string or an instance of Buffer, ArrayBuffer, or Array or an Array-like Object. Received nullTypeError [ERR_INVALID_ARG_TYPE]: The first argument must be of type string or an instance of Buffer, ArrayBuffer, or Array or an Array-like Object. Received null

      618 | 
      619 | function ksmAddrDecoder(data: string): Buffer {
    > 620 |   return Buffer.from(ss58Decode(data));
          |                 ^
      621 | }
      622 | 
      623 | function nodlAddrEncoder(data: Buffer): string {

      at Object.ksmAddrDecoder [as decoder] (src/index.ts:620:17)
      at Object.<anonymous> (src/__tests__/index.test.ts:1261:30)