Move some example deps to dev-dependencies

Author: rrbutani

Cargo.toml

@@ -11,16 +11,18 @@ readme = "README.md"
 [dependencies]
 tower-web = "0.3.6"
 tower-service = "0.1.0"
-tokio = "0.1.18"
 serde = "1.0.89"
 serde_json = "1.0.39"
 serde_plain = "0.3.0"
 futures = "0.1.25"
 prost = "0.5.0"
-prost-derive = "0.5.0"
 bytes = "0.4.12"
 http = "0.1.14"
+
+[dev-dependencies]
+tokio = "0.1.18"
 reqwest = "0.9.14"
 
+
 [build-dependencies]
 prost-build = "0.5.0"