Disconnect ResizeObserver when component unmounts to prevent memory-leak.

Author: oskarsjoberg-sl

src/inner-slider.js

@@ -122,6 +122,7 @@ export class InnerSlider extends React.Component {
     if (this.autoplayTimer) {
       clearInterval(this.autoplayTimer);
     }
+    this.ro.disconnect();
   };
   UNSAFE_componentWillReceiveProps = nextProps => {
     let spec = {
@@ -705,7 +706,7 @@ export class InnerSlider extends React.Component {
     let innerSliderProps = {
       className: className,
       dir: "ltr",
-      style:this.props.style
+      style: this.props.style
     };
 
     if (this.props.unslick) {