title: FileNotFoundError with flutter_dotenv
body: <p>I installed flutter_dotenv with this command:</p>
  <pre><code>flutter pub add flutter_dotenv
  </code></pre>
  <p>My is pubspec.yaml is like:</p>
  <pre><code>dependencies:
    flutter:
      flutter_dotenv: ^5.0.0
  
  flutter:
  assets:
      - .env
  </code></pre>
  <p>Then I put .env file in the project root (I will use .env.dev. .env.prd later so you see them in the screen shot):</p>
  <p><a href="https://i.stack.imgur.com/t7HuY.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/t7HuY.png" alt="enter image description here" /></a></p>
  <p>I run project from VSCode then get FileNotFoundError:
  <a href="https://i.stack.imgur.com/drbHY.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/drbHY.png" alt="enter image description here" /></a></p>
  <p>I checked the .env file location hundred of times, tried to change the file name, change the location to /lib etc - still no luck. Any idea?</p>