title: Parser error "bad indentation of a mapping entry" in Swagger Editor
body: <p>In the OpenAPI definition below, the parameter definition causes the parser error "bad indentation of a mapping entry". What is wrong?</p>
  
  <pre class="lang-yaml prettyprint-override"><code>paths:
    /users/{username}:
      get:
        tags:
          - users
        summary: "Get the users profile"
        parameters:
         -in: path
          name: username  
          description: "get user by name"
          type: string
          required: true
        responses:
          200:
            description: OK
            schema:
              $ref: "#/definitions/users"
  </code></pre>