title: Update part of object in Ionic Storage key/value pair
body: <p>I have an Ionic Storage DB with the following key/value pair:</p>
  
  <p><code>Key: settingsJSON
   Value: {toggleDates: false, toggleIndicator: false, toggleRepayments: false}</code></p>
  
  <p>Is there any way to update part of the object (i.e set <code>toggleDates</code> to <code>true</code>) without overriding the rest of object stored in the value?</p>
  
  <p>I've tried:</p>
  
  <pre><code> let settingsTemp = JSON.stringify({toggleDates: true});
   this.storage.set('settingsJSON', settingsTemp)
  </code></pre>
  
  <p>But this updates the entire object to <code>{toggleDates: true}</code>.</p>
  
  <p>I've also tried:</p>
  
  <pre><code>this.storage.set('settingsJSON.toggleDates', true)
  </code></pre>
  
  <p>But this just creates a new key/value named <code>settingsJSON.toggleDates</code>.</p>