docs: Update the readme with new screenshot

README.md

@@ -15,13 +15,13 @@ address bar.
   </a>
 </h3>
 
-<img src="https://user-images.githubusercontent.com/378023/49716908-7d2b0500-fc98-11e8-8f52-def504802509.png" width="880px" alt="Electron Fiddle screenshot">
+<img src="https://user-images.githubusercontent.com/1426799/52155868-d3357c80-2639-11e9-9496-fa97b1dc7897.jpg" width="880px" alt="Electron Fiddle screenshot">
 
 # Features
 
 ### Explore Electron
 
-![Screenshot: Electron App running](https://user-images.githubusercontent.com/1426799/43873856-5f66e56e-9b3d-11e8-8472-3a14d6a08c62.png)
+![Screenshot: Electron App running](https://user-images.githubusercontent.com/1426799/52155856-c0bb4300-2639-11e9-9962-a6354d08dc5a.jpg)
 
 Try Electron without installing any dependencies: Fiddle includes everything
 you'll need to explore the platform. It also includes examples for every API
@@ -40,7 +40,7 @@ all Electron APIs only a few keystrokes away.
 
 ### Compile and Package
 
-![Screenshot: Fiddle's Tasks Menu](https://user-images.githubusercontent.com/1426799/43874349-3f5abd74-9b40-11e8-9225-ddd1f1087a47.png)
+![Screenshot: Fiddle's Tasks Menu](https://user-images.githubusercontent.com/1426799/52155857-c0bb4300-2639-11e9-8776-e05dc528439c.png)
 
 Fiddle can automatically turn your experiment into binaries you can share with
 your friends, coworkers, or grandparents. It does so thanks to