Adding ruby implementation to Other implementation

Author: sreekanthgs

bip-0039.mediawiki

@@ -146,3 +146,6 @@ Haskell:
 JavaScript:
 * https://github.com/bitpay/bitcore-mnemonic
 * https://github.com/bitcoinjs/bip39 (used by [[https://github.com/blockchain/My-Wallet-V3/blob/v3.8.0/src/hd-wallet.js#L121-L146|blockchain.info]])
+
+Ruby:
+* https://github.com/sreekanthgs/bip_mnemonic