src: matrix: Read user agent name and version from cargo env

src/matrix.rs

@@ -133,7 +133,9 @@ async fn login(
     match auth_config {
         AuthConfig::PasswordAuthConfig{username, password} => {
             matrix_auth.login_username(username, password)
-                .initial_device_display_name("bender v0.2.0").await?;
+                .initial_device_display_name(
+                    format!("{} v{}", env!("CARGO_PKG_NAME"), env!("CARGO_PKG_VERSION")).as_str()
+                ).await?;
         },
         AuthConfig::TokenAuthConfig{user_id, device_id, access_token} => {
             matrix_auth.restore_session(