Add rev.2 pic

CHANGELOG.md

@@ -1,5 +1,13 @@
 # Board Revisions
 
+## Rev. 2.0 (2020-08-??)
+
+- Added support for 24 pin PALs
+- Use shift registers for input
+- Added LEDs to indicate activity on a socket
+
+![Rev. 2.0 PCB](pics/rev2.0_pcb.png)
+
 ## Rev. 1.1 (2020-08-15)
 
 - Fixed the ugly silkscreen from rev.1