Can not create a table with multiple primary key with SQLiteConnection.CreateTable<>()

I have an entity:

```
class Entity
    {
        [PrimaryKey]
        public int FirstKey { get; set; }

        [PrimaryKey]
        public int SecondKey { get; set; }
    }
```

I use SQLiteConnection.CreateTable<>() to create table:

```
SQLiteConnection.CreateTable<Entity>();
```

However, I got the following error: table "Entity" has more than one primary key.

Please help. Thank you.
