Merge rust-bitcoin/rust-bitcoin#1101: Remove the Pay-to-Contract reference from README.

0a0934a Remove the Pay-to-Contract reference from README. (sanket1729)

Pull request description:

  Removed in rust-bitcoin/rust-bitcoin#871

ACKs for top commit:
  apoelstra:
    ACK 0a0934a
  tcharding:
    ACK 0a0934a

Tree-SHA512: eed4e2f381effba8976668574bb2a19e524cf8d9fff305e1cde2bd09f52ae0100b8d06dc289bb0953433757c15301e89b88f71fa1255e0f18e695bb6e4f4af14

Author: apoelstra

README.md

@@ -27,7 +27,6 @@ Supports (or should support)
 * Script de/serialization
 * Private keys and address creation, de/serialization and validation (including full BIP32 support)
 * PSBT v0 de/serialization and all but the Input Finalizer role. Use [rust-miniscript](https://docs.rs/miniscript/latest/miniscript/psbt/index.html) to finalize.
-* Pay-to-contract support as in Appendix A of the [Blockstream sidechains whitepaper](https://www.blockstream.com/sidechains.pdf)
 
 For JSONRPC interaction with Bitcoin Core, it is recommended to use
 [rust-bitcoincore-rpc](https://github.com/rust-bitcoin/rust-bitcoincore-rpc).