title: Progress bar doesn't update angular
body: <p>Suppose I have a component html where there is my html my <a href="https://www.npmjs.com/package/angular-svg-round-progressbar" rel="nofollow noreferrer">progress bar</a></p>
  <pre><code> &lt;round-progress #progress
      [current]=&quot;current&quot;
  &lt;/round-progress&gt;
  </code></pre>
  <p>Current is the percentage value. In my ts component I do:</p>
  <pre><code>this.percentageSubscription = this.percentageService.percentage$.subscribe((percentage) =&gt; {
       this.current = this.current + percentage;
       console.log(this.current);
  });
  </code></pre>
  <p>The value that I print is correct. It is increase following another algorithm. The console.log show the correct increment but my percentage value is not increase in the progress bar.</p>
  <p>Can anyone help me?</p>