title: Configuration key 'authorizationUrl' is set to null but expected STRING]
body: <p>I am using securesocial master snapshot version in play framwork 2.6. The error says 'authorizationUrl' is expecting string, that is what I did. Please help if I am making any mistake.
  Below is my securesocial.conf file</p>
  
  <pre><code>  securesocial {
  
    applicationHost=localhost
    applicationPort=9000
  
    onLoginGoTo = /home
  
    onLogoutGoTo = /login
  
    ssl = false
  
    sessionTimeOut = 60
  
    github {
      authorizationUrl = "https://github.com/login/oauth/authorize"
      accessTokenUrl = "https://github.com/login/oauth/access_token"
      clientId = 30032e485b22d8fb97f7
      clientSecret = 1b0d88c23ff56612970ac446e972035ccafbbc3e
    }
  
    userpass {
      withUserNameSupport = false
      sendWelcomeEmail = true
      enableGravatarSupport = true
      signupSkipLogin = true
      tokenDuration = 60
      tokenDeleteInterval = 5
      minimumPasswordLength = 8
      enableTokenJob = true
      hasher = bcrypt
    }
  }
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/EO8B7.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/EO8B7.png" alt="enter image description here"></a></p>