Bump rust-bitcoin dep to 0.18

Author: TheBlueMatt

Cargo.toml

@@ -22,13 +22,13 @@ max_level_info = []
 max_level_debug = []
 
 [dependencies]
-bitcoin = "0.17"
+bitcoin = "0.18"
 bitcoin_hashes = "0.3"
 rand = "0.4"
 secp256k1 = "0.12"
 
 [dev-dependencies.bitcoin]
-version = "0.17"
+version = "0.18"
 features = ["bitcoinconsensus"]
 
 [dev-dependencies]

fuzz/Cargo.toml

@@ -18,7 +18,7 @@ libfuzzer_fuzz = ["libfuzzer-sys"]
 [dependencies]
 afl = { version = "0.4", optional = true }
 lightning = { path = "..", features = ["fuzztarget"] }
-bitcoin = { version = "0.17", features = ["fuzztarget"] }
+bitcoin = { version = "0.18", features = ["fuzztarget"] }
 bitcoin_hashes = { version = "0.3", features=["fuzztarget"] }
 hex = "0.3"
 honggfuzz = { version = "0.5", optional = true }