code: public ExpressionBuilder operator(List<Operator> operators) {
          for (Operator o : operators) {
              this.operator(o);
          }
          return this;
      }
docs: Add multiple {@link net.objecthunter.exp4j.operator.Operator} implementations which should be available for use in the expression
  @param operators the {@link java.util.List} of custom {@link net.objecthunter.exp4j.operator.Operator} implementations to add
  @return the ExpressionBuilder instance