algoliasearch: add missing type for removeStopWords
algoliasearch: add missing type for removeStopWords

closes https://github.com/algolia/algoliasearch-client-javascript/issues/741
georgemarshall/DefinitelyTyped,dsebastien/DefinitelyTyped,mcliment/DefinitelyTyped,dsebastien/DefinitelyTyped,markogresak/DefinitelyTyped,borisyankov/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,borisyankov/DefinitelyTyped