Reorg the order of deps (#284)

* Reorg the order of deps

This patch is simply for easier editor operation when replacing the
substrate deps.

* .

proc-macro/Cargo.toml

@@ -29,10 +29,11 @@ async-std = { version = "1.8.0", features = ["attributes"] }
 codec = { package = "parity-scale-codec", version = "2.0.0", features = ["derive"] }
 env_logger = "0.8.2"
 pretty_assertions = "0.6.1"
-sp-keyring = "3.0.0"
 substrate-subxt = { path = ".." }
 trybuild = "1.0.38"
 
+sp-keyring = "3.0.0"
+
 [[test]]
 name = "balances"
 path = "tests/balances.rs"