src/SearchParameters/index.js
function addTagRefinement(tag) {
    if (this.isTagRefined(tag)) return this;

    var modification = {
      tagRefinements: this.tagRefinements.concat(tag)
    };

    return this.setQueryParameters(modification);
  }
function addTagRefinement(tag) {
    if (this.isTagRefined(tag)) return this;

    var modification = {
      tagRefinements: this.tagRefinements.concat(tag)
    };

    return this.setQueryParameters(modification);
  }
addTagRefinement adds a tag to the list used to filter the results
@param {string} tag tag to be added
@return {SearchParameters}