Cosmetic fix

Author: artem-v

services-api/src/main/java/io/scalecube/services/Reflect.java

@@ -285,8 +285,9 @@ public static void validateMethodOrThrow(Method method) {
     validateResponseType(method);
     validateRequestType(method);
 
-    if (method.getParameterCount() > 2) {
-      throw new UnsupportedOperationException("Service method can accept maximum 2 parameters");
+    if (method.getParameterCount() > 1) {
+      throw new UnsupportedOperationException(
+          "Service method can accept at maximum single parameter");
     }
   }