include_md 0.2.1

Include markdown file or its section.
Documentation
# Introduction

Welcome to the test fixture.

## Overview

This subsection is under Introduction.

### Detail

A nested subsection.

# Usage

How to use the library.

## Installation

Run cargo add.

## Configuration

Set options here.

# Notes

Final section with no subsections.

# Notes

This is the second Notes section (duplicate heading test).