Small history table change

sql/history.sql

@@ -2,7 +2,7 @@ create table history
 (
     id INTEGER
         primary key autoincrement,
-    set_id INTEGER not null references decks on delete cascade,
+    deck_id INTEGER not null references decks on delete cascade,
     word_id INTEGER not null references words on delete cascade,
     timestamp INTEGER not null,
     answer INTEGER not null,