Switch to a common "User-Agent" string.

Fixes Mnetwork, again.

Signed-off-by: Jeffrey Han <itdelatrisu@gmail.com>

src/itdelatrisu/opsu/Utils.java

@@ -534,7 +534,7 @@ public static String readDataFromUrl(URL url) throws IOException {
 		conn.setConnectTimeout(Download.CONNECTION_TIMEOUT);
 		conn.setReadTimeout(Download.READ_TIMEOUT);
 		conn.setUseCaches(false);
-		conn.setRequestProperty("User-Agent", "Mozilla/5.0...");
+		conn.setRequestProperty("User-Agent", Options.USER_AGENT);
 		try {
 			conn.connect();
 		} catch (SocketTimeoutException e) {

src/itdelatrisu/opsu/downloads/Download.java

@@ -20,6 +20,7 @@
 
 import itdelatrisu.opsu.ErrorHandler;
 import itdelatrisu.opsu.Utils;
+import itdelatrisu.opsu.options.Options;
 
 import java.io.File;
 import java.io.FileOutputStream;
@@ -221,7 +222,7 @@ public void run() {
 						// allow HTTP <--> HTTPS redirects
 						// http://download.java.net/jdk7u2/docs/technotes/guides/deployment/deployment-guide/upgrade-guide/article-17.html
 						conn.setInstanceFollowRedirects(false);
-						conn.setRequestProperty("User-Agent", "Mozilla/5.0...");
+						conn.setRequestProperty("User-Agent", Options.USER_AGENT);
 						if (requestHeaders != null) {
 							for (Map.Entry<String, String> entry : requestHeaders.entrySet())
 								conn.setRequestProperty(entry.getKey(), entry.getValue());

src/itdelatrisu/opsu/options/Options.java

@@ -120,6 +120,10 @@ public class Options {
 	/** Version file name. */
 	public static final String VERSION_FILE = "version";
 
+	/** The user agent to use in HTTP requests. */
+	public static final String USER_AGENT =
+		"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36";
+
 	/** The beatmap directory. */
 	private static File beatmapDir;