feat: Bump dependencies version

- Bump riemann client to 0.8.0
- Bump protobuff to 2.20.0

Author: uggla

Cargo.toml

@@ -18,9 +18,9 @@ clap = "2.33.3"
 regex = "1"
 procfs = "0.8.1"
 actix-web = "3"
-riemann_client = "0.7.0"
+riemann_client = "0.8.0"
 hostname = "0.3.1"
-protobuf = "^1.0.0"
+protobuf = "2.20.0"
 
 [profile.release]
 lto = true