Add OS check to notifier

Author: hSATAC

src/notifier.rb

@@ -11,7 +11,7 @@ def self.notify(msg, options = {})
 	end
 
 	def self.is_support
-    TerminalNotifier.available?
+    org.jruby.platform.Platform::IS_MAC && TerminalNotifier.available?
 	end
 
 end