Bump bitcoin dependency to 0.27

Author: romanz

integration_test/Cargo.toml

@@ -5,6 +5,6 @@ authors = ["Steven Roose <steven@stevenroose.org>"]
 
 [dependencies]
 bitcoincore-rpc = { path = "../client" }
-bitcoin = { version = "0.26", features = [ "use-serde", "rand" ] }
+bitcoin = { version = "0.27", features = [ "use-serde", "rand" ] }
 lazy_static = "1.4.0"
 log = "0.4"

json/Cargo.toml

@@ -21,4 +21,4 @@ path = "src/lib.rs"
 serde = { version = "1", features = [ "derive" ] }
 serde_json = "1"
 
-bitcoin = { version = "0.26", features = [ "use-serde" ] }
+bitcoin = { version = "0.27", features = [ "use-serde" ] }