Update installation section in documentation
Update installation section in documentation

dsgraham/jquery-date-range-picker,longbill/jquery-date-range-picker,darkdiesel/jquery-date-range-picker,longbill/jquery-date-range-picker,dsgraham/jquery-date-range-picker,fede91it/jquery-date-range-picker,darkdiesel/jquery-date-range-picker,fede91it/jquery-date-range-picker