title: How to define a map in TOML?
body: <p>How to define a map in TOML?</p>
  <p>For example, I want to define something like:</p>
  <pre><code>[FOO]
  
  Usernames_Passwords='{&quot;user1&quot;:&quot;pass1&quot;,&quot;user2&quot;:&quot;pass2&quot;}'
  </code></pre>
  <p>and then in go convert them to a map[string]string</p>