code: public RetryerBuilder<V> retryIfRuntimeException() {
          rejectionPredicate = Predicates.or(rejectionPredicate, new ExceptionClassPredicate<V>(RuntimeException.class));
          return this;
      }
docs: Configures the retryer to retry if a runtime exception (i.e. any <code>RuntimeException</code> or subclass
  of <code>RuntimeException</code>) is thrown by the call.
  
  @return <code>this</code>