Update README.md

Updated to use my YT thumb generator

Author: visrealm

README.md

@@ -25,19 +25,19 @@ A copy of most files from [https://cpu.visualrealmsoftware.com](https://cpu.visu
 
 ## Videos
 ##### An overview
-[![An overview.](http://img.youtube.com/vi/7H-PHc1CNSU/0.jpg)](https://youtu.be/7H-PHc1CNSU "My 8-bit breadboard computer, assembler, emulator and esp8266 program loader. An overview.")
+[![An overview.](https://img.visualrealmsoftware.com/youtube/thumb/7H-PHc1CNSU)](https://youtu.be/7H-PHc1CNSU "My 8-bit breadboard computer, assembler, emulator and esp8266 program loader. An overview.")
 
 ##### Snake!
-[![Snake!](http://img.youtube.com/vi/xVAOxb0N3pg/0.jpg)](https://youtu.be/xVAOxb0N3pg "Snake! on my Ben Eater inspired 8-bit breadboard computer.")
+[![Snake!](https://img.visualrealmsoftware.com/youtube/thumb/xVAOxb0N3pg)](https://youtu.be/xVAOxb0N3pg "Snake! on my Ben Eater inspired 8-bit breadboard computer.")
 
 ##### Virtual versus reality. 
-[![Virtual versus reality.](http://img.youtube.com/vi/90tw-9bhMc0/0.jpg)](http://www.youtube.com/watch?v=90tw-9bhMc0 "Virtual versus reality. My Ben Eater inspired computer and emulator.")
+[![Virtual versus reality.](https://img.visualrealmsoftware.com/youtube/thumb/90tw-9bhMc0)](http://www.youtube.com/watch?v=90tw-9bhMc0 "Virtual versus reality. My Ben Eater inspired computer and emulator.")
 
 ##### Troy's breadboard computer - Triangular numbers
-[![Troy's breadboard computer - Triangular numbers](http://img.youtube.com/vi/Zj5HfeiyHRU/0.jpg)](http://www.youtube.com/watch?v=Zj5HfeiyHRU "My Ben Eater (and James Bates) inspired 8-bit computer..(Triangular numbers)")
+[![Troy's breadboard computer - Triangular numbers](https://img.visualrealmsoftware.com/youtube/thumb/Zj5HfeiyHRU)](http://www.youtube.com/watch?v=Zj5HfeiyHRU "My Ben Eater (and James Bates) inspired 8-bit computer..(Triangular numbers)")
 
 ##### Troy's breadboard computer - Emulator
-[![Troy's breadboard computer - Emulator](http://img.youtube.com/vi/omVyW-ZOdC8/0.jpg)](http://www.youtube.com/watch?v=omVyW-ZOdC8 "Web-based Emulator of my Ben Eater inspired 8-bit computer")
+[![Troy's breadboard computer - Emulator](https://img.visualrealmsoftware.com/youtube/thumb/omVyW-ZOdC8)](http://www.youtube.com/watch?v=omVyW-ZOdC8 "Web-based Emulator of my Ben Eater inspired 8-bit computer")
 
 ## License
 This code is licensed under the [MIT](https://opensource.org/licenses/MIT "MIT") license