Update 4 6 time series data

4-6-time-series-data.md

@@ -54,7 +54,7 @@ To see the changes of the temperature over time, you can:
 *  click the upper part of the *Play* button and see the change continuously over time. You can also set the time interval and repeat option by clicking the lower part of the *Play* button.
 
 <p align="center">
-![](img/4-6-temperature-change-animation.png)
+![](img/4-6-temperature-change-animation.gif)