Release version 1.2.0

Add the getSObjectType() method.

Add anti-join feature in the `addConditionNotIn`, `conditionNotIn` methods.

Add the toLabel method.

Add FieldSettings for the `selectAllFields` method.

Release version 1.1.0

Add semi-join feature in the `addConditionIn`, `conditionIn` and `lookup`
methods.

Modify `toQueryString` method to return an executable query string.

Allow alias in the `selectField` method when using aggregate functions.

Add the VERSION constant.

Release version 1.0.0