Updated Read timer (markdown)

Read-timer.md

@@ -2,10 +2,9 @@ A countdown timer to display a message after a user defined time.
 
 Screenshots:
 
-![Read timer](https://github.com/koreader/koreader/wiki/screenshots/reader_timer/reader_timer1.png)
-
-![Read timer](https://github.com/koreader/koreader/wiki/screenshots/reader_timer/reader_timer2.png)
-
-![Read timer](https://github.com/koreader/koreader/wiki/screenshots/reader_timer/reader_timer2.png)
-
+<img width="400" alt="reader timer" src=https://github.com/koreader/koreader/wiki/screenshots/reader_timer/reader_timer1.png>
+<br/>
+<img width="400" alt="reader timer" src=https://github.com/koreader/koreader/wiki/screenshots/reader_timer/reader_timer2.png>
+<br/>
+<img width="400" alt="reader timer" src=https://github.com/koreader/koreader/wiki/screenshots/reader_timer/reader_timer3.png>