moved logger auth success to req,event classes

override to_s for req,event classes

rename authenticate to identify in base class

lib/obsws/req.rb

@@ -14,10 +14,15 @@ module OBSWS
 
       def initialize(**kwargs)
         @base_client = Base.new(**kwargs)
+        LOGGER.info("#{self} succesfully identified with server")
         @base_client.add_observer(self)
         @response = { requestId: 0 }
       end
 
+      def to_s
+        "#{self.class.name.split("::").last(2).join("::")}"
+      end
+
       def run
         yield
       ensure