Merge #185: Exposed RangeProofMessage publically

386e3b8 Exposed RangeProofMessage publically (i5hi)

Pull request description:

  The `RangeProofMessage` stuct needs to be publically exposed for usage of [confidential::Value::blind](https://docs.rs/elements/latest/elements/confidential/enum.Value.html#method.blind)

ACKs for top commit:
  apoelstra:
    ACK 386e3b8

Tree-SHA512: dacb67a69a59ee413e5bfefc4d7782f03841bb90057de91f3de955f5811b3c6f1751bc60415acddc5b4beb5989af30d15dc8d0ba88c948683b744cdf850e5a12

src/lib.rs

@@ -71,7 +71,7 @@ pub use bitcoin::hashes;
 pub use crate::address::{Address, AddressParams, AddressError};
 pub use crate::transaction::{OutPoint, PeginData, PegoutData, EcdsaSighashType, TxIn, TxOut, TxInWitness, TxOutWitness, Transaction, AssetIssuance};
 pub use crate::transaction::Sequence;
-pub use crate::blind::{ConfidentialTxOutError, TxOutSecrets, SurjectionInput, TxOutError, VerificationError, BlindError, UnblindError, BlindValueProofs, BlindAssetProofs};
+pub use crate::blind::{ConfidentialTxOutError, TxOutSecrets, SurjectionInput, TxOutError, VerificationError, BlindError, UnblindError, BlindValueProofs, BlindAssetProofs, RangeProofMessage};
 pub use crate::block::{BlockHeader, Block};
 pub use crate::block::ExtData as BlockExtData;
 pub use ::bitcoin::consensus::encode::VarInt;