Update license

Author: alcuadrado

packages/ethereum-cryptography/LICENSE

@@ -1,8 +1,5 @@
-elliptic-secp256k1.js is based on secp256k1-node, which is released under the
-MIT license by the licesecp256k1-node contributors. Its license complete license can be found here: https://github.com/cryptocoinjs/secp256k1-node/blob/2f1c956d71c39e5667e6285a6dafc15ce28e86f0/LICENSE
-
-scryptsy-without-crypto.js is based on scryptsy, which is released under the
-MIT license by the cryptocoinjs. Its license complete license can be found here: https://github.com/cryptocoinjs/scryptsy/blob/395c3b09b21e06ea4a6cc2933e046c0984a414c5/LICENSE
+bip39-without-wordlist.js is based on bip39, which is released under the
+ISC license by the Wei Lu and Daniel Cousens. Its license complete license can be found here: https://github.com/bitcoinjs/bip39/blob/0a0e74eac9f4b753939dd6368984900fdba1975b/LICENSE
 
 hdkey-without-crypto.js is based on hdkey, which is released under the
 MIT license by the cryptocoinjs. Its license complete license can be found here: https://github.com/cryptocoinjs/hdkey/blob/87d5495ac8e4dfe9917ddcebf6788ce69c0695ff/LICENSE