code: function getStreaks(contributions) {
    const start = contributions[0].date;
    const end = contributions.slice(-1)[0].date;
    const streak = {days: 0, start: null, end: null, unmeasurable: false};
    let currentStreak = Object.assign({}, streak);
    let longestStreak = Object.assign({}, streak);
    contributions.forEach(ret => {
      if (ret.count > 0) {
        currentStreak.days += 1;
        currentStreak.end = ret.date;
        if (!currentStreak.start) {
          currentStreak.start = ret.date;
        }
        if (currentStreak.days >= longestStreak.days) {
          longestStreak = Object.assign({}, currentStreak);
        }
      } else if (ret.date !== end) {
        currentStreak = Object.assign({}, streak);
      }
    });
    if (currentStreak.start === start && currentStreak.end === end) {
      currentStreak.unmeasurable = true;
      longestStreak.unmeasurable = true;
    }
    return {currentStreak, longestStreak};
  }
docs: Parse data to streak
  
  @param {Array<{date: string, count: number}>} contributions - List of contributions
  @return {{currentStreak: Streak, longestStreak: Streak}}