修复数据库升级的字段问题

app/src/main/java/com/gh/gamecenter/room/AppDatabase.java

@@ -77,7 +77,7 @@ public abstract class AppDatabase extends RoomDatabase {
         @Override
         public void migrate(@NonNull SupportSQLiteDatabase database) {
             database.execSQL("Alter TABLE AnswerEntity add articleTitle TEXT");
-            database.execSQL("Alter TABLE AnswerEntity add type TEXT");
+            database.execSQL("Alter TABLE AnswerEntity add type TEXT NOT NULL");
         }
     };