Add NOT BETWEEN SQL operator

[SOHELAHMED7]

In case of date related (date data type) fields such as birth_date, order_date etc

and in case of "NOT BETWEEN" SQL operator which jQuery query builder support

I am getting below error

Undefined index
not_between

Upon investigating, I found that NOT BETWEEN is missing from operators list

https://github.com/leandrogehlen/yii2-querybuilder/blob/master/Translator.php#L67

When I add

'not_between' =>      ['op' => 'NOT BETWEEN ?',   'list' => true, 'sep' => ' AND '],

the issue is fixed.

So this PR adds NOT_BETWEEN SQL operator

[cebe]

@leandrogehlen thank you for the fast merge! could you also please tag a new version?

[leandrogehlen]

@cebe the release has been tagged