message: Add: wallet object `otherAddresses` prop documentation
diff: @@ -15,6 +15,7 @@ WalletInstance {
  mnemonic: String,
  path?: String, // deprecated, will be renamed to `derivationPath`
  derivationPath?: Promise<String>,
  + otherAddresses: Array<String>,
  privateKey: String,
  privateKeyQR: Promise<String>, // deprecated
  publicKey: Promise<String>,
  @@ -44,6 +45,7 @@ _**Example:** Instantiating a software wallet using an existing `privateKey` wil
  * [`mnemonic`](#mnemonic)
  * [`path`](#path)
  * [`derivationPath`](#derivationpath)
  + * [`otherAddresses`](#otheraddresses)
  * [`privateKey`](#privatekey)
  * [`privateKeyQR`](#privatekeyqr)
  * [`publicKey`](#publickey)
  @@ -226,6 +228,37 @@ walet.setDefaultAddress(1);
  console.log(await wallet.derivationPath); // m/44'/60'/0'/0/1
  ```
  +### `otherAddresses`
  +```js
  +WalletInstance.otherAddresses: Array<String>
  +```
  +
  +_Note: This prop is only available on Hardware Wallet types (eg: Trezor)_.
  +
  +It contains an `Array` of all the addresses that were derived _(opened)_ initially when opening the wallet, by specifying a number to the `addressCount` prop. _(The addresses in the `Array` are in `String` format)_.
  +
  +This is useful to see all the addresses that you have access to.
  +
  +Note, that if only one address was derived _(opened)_ when you opened the wallet _(eg: `{ addressCount : 1 }`)_, than this prop will be `undefined`. This is because it will only contain one entry, which is also the default selected address _(See: [`setDefaultAddress`](#setdefaultaddress))_, so there's no point, as it will just repeat information.
  +
  +```js
  +import { open } from 'colony-wallet/hardware/trezor';
  +
  +const multipleAddresesWallet = await open();
  +
  +console.log(wallet.otherAddress); // [0x56B4...8173, 0x0F91...d9A8, 0x26eB...bAD1, 0xb883...49F6, 0x9d4E...7dbc, 0x4a59...8526, 0x9E8b...5C28, 0x6F29...A682, 0x4BAB...5aFb, 0x9677...9647]
  +
  +console.log(wallet.otherAddress.length); // 10
  +```
  +
  +```js
  +import { open } from 'colony-wallet/hardware/trezor';
  +
  +const multipleAddresesWallet = await open({ addressCount: 1 });
  +
  +console.log(wallet.otherAddress); // undefined
  +```
  +
  ### `privateKey`
  ```js
  WalletInstance.privateKey: String
  