Deny unused crate dependencies (#549)

* subxt unused crate deps

* Deny unused dependencies

cli/Cargo.toml

@@ -19,8 +19,6 @@ path = "src/main.rs"
 subxt-codegen = { version = "0.21.0", path = "../codegen" }
 # perform node compatibility
 subxt-metadata = { version = "0.21.0", path = "../metadata" }
-# information of portable registry
-scale-info = "2.0.0"
 # parse command line args
 structopt = "0.3.25"
 # make the request to a substrate node to get the metadata

cli/src/main.rs

@@ -14,6 +14,8 @@
 // You should have received a copy of the GNU General Public License
 // along with subxt.  If not, see <http://www.gnu.org/licenses/>.
 
+#![deny(unused_crate_dependencies)]
+
 use color_eyre::eyre::{
     self,
     WrapErr,