honour Date object passed as legacy 2nd arg to isAfter / isBefore#2783

HrachShah wants to merge 5 commits into

validatorjs:mastervalidatorjs/validator.js:masterfrom

HrachShah:fix/isAfter-isBefore-ignore-date-arg-when-object-passed-as-comparisonDateHrachShah/validator.js:fix/isAfter-isBefore-ignore-date-arg-when-object-passed-as-comparisonDateCopy head branch name to clipboard