Allow updating height and color options through props

Use Wavesurfer setter methods to update `waveColor`, `progressColor`,
`cursorColor` and `height` if the value changed inside the `options`
prop.

src/react-wavesurfer.js

@@ -238,6 +238,22 @@ class Wavesurfer extends Component {
       this._wavesurfer.setPlaybackRate(nextProps.options.audioRate);
     }
 
+    if (nextProps.options.waveColor !== this.props.options.waveColor) {
+      this._wavesurfer.setWaveColor(nextProps.options.waveColor);
+    }
+
+    if (nextProps.options.progressColor !== this.props.options.progressColor) {
+      this._wavesurfer.setProgressColor(nextProps.options.progressColor);
+    }
+
+    if (nextProps.options.cursorColor !== this.props.options.cursorColor) {
+      this._wavesurfer.setCursorColor(nextProps.options.cursorColor);
+    }
+
+    if (nextProps.options.height !== this.props.options.height) {
+      this._wavesurfer.setHeight(nextProps.options.height);
+    }
+
     // turn responsive on
     if (nextProps.responsive && this.props.responsive !== nextProps.responsive) {
       window.addEventListener('resize', this._handleResize, false);