code: public Retryer<R> exponentialWait(long multiplier, long maximumTime, TimeUnit maximumUnit) {
          return exponentialWait(multiplier, checkNotNull(maximumUnit).toMillis(maximumTime));
      }
docs: Sets the wait strategy which sleeps for an exponential amount of time after the first failed attempt
  
  @see Retryer#exponentialWait(long, long)
  @param multiplier
  @param maximumTime
  @param maximumUnit
  @return