Downgrade Tokio version

Author: Conor Okus

examples/bitcoind-rpc-client/Cargo.toml

@@ -19,7 +19,7 @@ bech32 = { version = "0.8.1" }
 hex = { version = "0.4.3" }
 
 serde_json = { version = "1.0.73" }
-tokio = { version = "1.15.0", features = [ "io-util", "macros", "rt", "rt-multi-thread", "sync", "net", "time" ] }
+tokio = { version = "1.14.0", features = [ "io-util", "macros", "rt", "rt-multi-thread", "sync", "net", "time" ] }
 
 [profile.release]
 panic = "abort"