title: Android Kotlin what need to be used other than get() or getValue() on ObservableField
body: <p>I updated Kotlin version to 1.2.31 and getting the following warning.</p>
  
  <pre><code>Do not explicitly call 'get()' on ObservableFields or 'getValue()' 
  on LiveData in an expression. This support will be removed soon. 
  </code></pre>
  
  <p>Now What function should I use?</p>