fix validate rich menu method name

Author: kenta-takeuchi

lib/line/bot/client.rb

@@ -547,12 +547,12 @@ def create_rich_menu(rich_menu)
         post(endpoint, endpoint_path, rich_menu.to_json, credentials)
       end
 
-      # Validate a rich menu
+      # Validate a rich menu object
       #
       # @param rich_menu [Hash] The rich menu represented as a rich menu object
       #
       # @return [Net::HTTPResponse]
-      def validate_rich_menu(rich_menu)
+      def validate_rich_menu_object(rich_menu)
         channel_token_required
 
         endpoint_path = '/bot/richmenu/validate'

spec/line/bot/rich_menu_spec.rb

@@ -95,11 +95,11 @@
       .with(body: JSON.parse(RICH_MENU_CONTENT).to_json)
   end
 
-  it 'validates a rich menu' do
+  it 'validates a rich menu object' do
     uri_template = Addressable::Template.new Line::Bot::API::DEFAULT_ENDPOINT + '/bot/richmenu/validate'
     stub_request(:post, uri_template).to_return(body: '{}', status: 200)
 
-    client.validate_rich_menu(JSON.parse(RICH_MENU_CONTENT))
+    client.validate_rich_menu_object(JSON.parse(RICH_MENU_CONTENT))
     expect(WebMock).to have_requested(:post, Line::Bot::API::DEFAULT_ENDPOINT + '/bot/richmenu/validate')
   end