Moved user agent string creation thingy into a method.

src/ATProto/XrpcClient.php

@@ -20,7 +20,7 @@ class XrpcClient {
             'base_uri' => sprintf('%s/xrpc/', rtrim($service, '/')),
             'timeout' => 10,
             'headers' => [
-                'User-Agent' => sprintf('Misuzu/%s', Misuzu::version()),
+                'User-Agent' => Misuzu::userAgent(),
             ],
         ]);
     }

src/Misuzu.php

@@ -36,6 +36,10 @@ final class Misuzu {
         return trim($version);
     }
 
+    public static function userAgent(): string {
+        return sprintf('%s/%s', __NAMESPACE__, self::version());
+    }
+
     public static function debug(): bool {
         return !empty(ini_get('display_errors'));
     }