title: IntelliJ issues error for 'false' value in yaml
body: <p>Whenever in <code>.yml</code> file that I have a <code>false</code> property value I am getting a inspection error from IntelliJ. This happened only recently, I am using IntelliJ 2019.3.5</p>
  <blockquote>
  <p>Invalid value 'false', must be one of off|on|true|true
  Inspection info: Checks Spring Boot application .yaml configuration files. Highlights unresolved and deprecated configuration keys and invalid values.</p>
  </blockquote>
  <p>The application runs fine but I'd like to know what causes this and if I should turn the inspection off.</p>