Update README.md

Author: spektor56

README.md

@@ -1,6 +1,6 @@
 # PegasusExportPlugin
 Plugin for launchbox to export to pegasus format
-![alt text](https://github.com/spektor56/PegasusExportPlugin/blob/master/PegasusExportPlugin/img/img0.JPG)
+![alt text](https://github.com/spektor56/PegasusExportPlugin/blob/master/PegasusExportPlugin/img/img0.jpg)
 ![alt text](https://github.com/spektor56/PegasusExportPlugin/blob/master/PegasusExportPlugin/img/img1.JPG)
 ![alt text](https://github.com/spektor56/PegasusExportPlugin/blob/master/PegasusExportPlugin/img/img2.JPG)
 ![alt text](https://github.com/spektor56/PegasusExportPlugin/blob/master/PegasusExportPlugin/img/img3.JPG)