Support conditional Operator AND/OR

[Jerkz08]

hello, I love the component but I'm lacking some feature like:

support of conditional operator AND/OR
I notice it has maximum of 3 sequence to complete encapsulation (field + operator + value). It would be nice if can customize to four (4) sequence (conditional + field + operator + value).

[kevalbhatt]

We are working on that https://github.com/kevalbhatt/react-structured-query-search/tree/v1.0.0-alpha.6, will publish the version by this weekend