Update README: palette count

Author: mcpcpc

README

@@ -10,7 +10,7 @@ This project was inspired by Dylan Arap's POSIX shell script, okpal [0], which
 utilizes 16 ANSI colors to control the color scheme of existing terminal-emulator
 windows. This allows one to achieve consistent colors across all terminal 
 utilities and applications. This application has similar functionality to okpal 
-but is designed with execution speed in mind. There are currently 320 light and 
+but is designed with execution speed in mind. There are currently 300 light and 
 dark color palettes offered at this time that can be applied and quickly swapped 
 out for others.