skillYears( skill, rez ) {
    const sk = _.find(rez.skills.list, sk => sk.name.toUpperCase() === skill.toUpperCase());
    if (sk) { return sk.years; } else { return '?'; }
  }
Given the name of a skill ("JavaScript" or "HVAC repair"), return the number
  of years assigned to that skill in the resume.skills.list collection.