Make ClientOptions public.

src/proto/server/client.rs

@@ -31,11 +31,10 @@ impl Default for Version {
 }
 
 /// Specifies options for a new `Client`.
-#[derive(Default)]
-struct ClientOptions {
-  user_name: String,
-  password: String,
-  version: Version,
+pub struct ClientOptions {
+  pub user_name: String,
+  pub password: String,
+  pub version: Version,
 }
 
 /// A client for the client-server protocol.