Remove unused Game instance variable protocol_version

src/main.rs

@@ -77,7 +77,6 @@ pub struct Game {
     chunk_builder: chunk_builder::ChunkBuilder,
 
     connect_reply: Option<mpsc::Receiver<Result<server::Server, protocol::Error>>>,
-    protocol_version: i32,
 
     dpi_factor: f64,
     last_mouse_x: f64,
@@ -100,7 +99,6 @@ impl Game {
             },
         };
 
-        self.protocol_version = protocol_version;
         let (tx, rx) = mpsc::channel();
         self.connect_reply = Some(rx);
         let address = address.to_owned();
@@ -267,7 +265,6 @@ pub fn main() {
         should_close: false,
         chunk_builder: chunk_builder::ChunkBuilder::new(resource_manager, textures),
         connect_reply: None,
-        protocol_version: protocol::SUPPORTED_PROTOCOLS[0],
         dpi_factor,
         last_mouse_x: 0.0,
         last_mouse_y: 0.0,