Add memberJoined and memberLeft event class

Author: kimoto

lib/line/bot/event/member_join.rb

@@ -0,0 +1,22 @@
+# Copyright 2016 LINE
+#
+# LINE Corporation licenses this file to you under the Apache License,
+# version 2.0 (the "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+module Line
+  module Bot
+    module Event
+      class MemberJoin < Base
+      end
+    end
+  end
+end

lib/line/bot/event/member_leave.rb

@@ -0,0 +1,22 @@
+# Copyright 2016 LINE
+#
+# LINE Corporation licenses this file to you under the Apache License,
+# version 2.0 (the "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+module Line
+  module Bot
+    module Event
+      class MemberLeave < Base
+      end
+    end
+  end
+end