code: public RetryerBuilder<V> retryIfException(@Nonnull Predicate<Throwable> exceptionPredicate) {
          Preconditions.checkNotNull(exceptionPredicate, "exceptionPredicate may not be null");
          rejectionPredicate = Predicates.or(rejectionPredicate, new ExceptionPredicate<V>(exceptionPredicate));
          return this;
      }
docs: Configures the retryer to retry if an exception satisfying the given predicate is
  thrown by the call.
  
  @param exceptionPredicate the predicate which causes a retry if satisfied
  @return <code>this</code>