Remove 21 Machine Wallet

Link is broken, gives 404.

Author: torkelrogstad

bip-0044.mediawiki

@@ -273,7 +273,6 @@ is required and a pull request to the above file should be created.
 * [[https://trezor.io/|TREZOR]] ([[https://github.com/trezor/|source]])
 * [[https://www.keepkey.com/|KeepKey]] ([[https://github.com/keepkey/|source]])
 * [[https://www.ledgerwallet.com/|Ledger Wallet]] ([[https://github.com/LedgerHQ|source]])
-* [[https://21.co/learn/21-lib-wallet/|21 Machine Wallet]] ([[https://github.com/21dotco|source]])
 * [[https://trustwalletapp.com/|Trust Wallet]] ([[http://github.com/trustWallet/|source]])
 
 ==Reference==