Upgrading the dependency bitcoincore-rpc to v0.16 to match the nested bitcoin crate to the one used in bdk v0.25

Author: ulrichard

Cargo.toml

@@ -10,7 +10,7 @@ rust-version = "1.57"
 edition = "2018"
 
 [dependencies]
-bitcoincore-rpc = "0.15.0"
+bitcoincore-rpc = "0.16"
 tempfile = "3.1"
 log = "0.4"
 which = "4.2.5"