[Protocol] Fix Minecraft Java query not being able to specify a hostname (#91)

* Make initial fix

* Fix imports

* Rename query_address to hostname and add this to the mc example

* Fix master_querant example not compiling

* Add extra safety on converting strings to Minecraft Varint strings

* Add docs to RequestSettings

* Fix formatting

examples/master_querant.rs

@@ -126,7 +126,7 @@ fn main() -> GDResult<()> {
             )
         }
         "mc" => println!("{:#?}", mc::query(ip, port)?),
-        "mc_java" => println!("{:#?}", mc::query_java(ip, port)?),
+        "mc_java" => println!("{:#?}", mc::query_java(ip, port, None)?),
         "mc_bedrock" => println!("{:#?}", mc::query_bedrock(ip, port)?),
         "mc_legacy" => println!("{:#?}", mc::query_legacy(ip, port)?),
         "mc_legacy_vb1_8" => {

examples/minecraft.rs

@@ -1,9 +1,28 @@
 use gamedig::games::mc;
+use gamedig::protocols::minecraft::RequestSettings;
 
 fn main() {
     // or Some(<port>), None is the default protocol port (which is 25565 for java
     // and 19132 for bedrock)
     let response = mc::query(&"127.0.0.1".parse().unwrap(), None);
+    // This will fail if no server is available locally!
+
+    match response {
+        Err(error) => println!("Couldn't query, error: {}", error),
+        Ok(r) => println!("{:#?}", r),
+    }
+
+    // This is an example to query a server with a hostname to be specified in the
+    // packet. Passing -1 on the protocol_version means anything, note that
+    // an invalid value here might result in server not responding.
+    let response = mc::query_java(
+        &"209.222.114.62".parse().unwrap(),
+        Some(25565),
+        Some(RequestSettings {
+            hostname: "mc.hypixel.net".to_string(),
+            protocol_version: -1,
+        }),
+    );
 
     match response {
         Err(error) => println!("Couldn't query, error: {}", error),