add twitch stream notify

schema/20180628-1.sql

@@ -0,0 +1,2 @@
+ALTER TABLE public.twitch_channel DROP type;
+ALTER TABLE public.line_twitch_rt ADD type varchar(100) DEFAULT '' NOT NULL;

schema/20180628-2.sql

@@ -0,0 +1 @@
+ALTER TABLE public.twitch_channel ADD laststream varchar(100) DEFAULT '' NOT NULL;