README: ask for users to post examples

Author: dcousens

README.md

@@ -101,6 +101,8 @@ The below examples are implemented as integration tests, they should be very eas
 - [Recover a BIP32 parent private key from the parent public key and a derived non-hardened child private key](https://github.com/bitcoinjs/bitcoinjs-lib/blob/master/test/integration/crypto.js#L54)
 - [Recover a Private key from duplicate R values in a signature](https://github.com/bitcoinjs/bitcoinjs-lib/blob/master/test/integration/crypto.js#L101)
 
+If you have a use case that you feel could be listed here, please [ask for it](https://github.com/bitcoinjs/bitcoinjs-lib/issues/new)!
+
 
 ## Projects utilizing BitcoinJS