Update README

README.md

 # ATTINY44A_blink
 
-This repo contains a variety of "hello world" type programs for an ATTINY44a
-connected to an LED and a button. Not coincidentally this is the sort of board I
+This repo contains a variety of simple programs for an ATTINY44A.
+
+The majority are simple "hello world" type programs that only assume connection to
+an LED and a button. Not coincidentally this is the sort of board I
 ended up with after modifying Neil's
 [echo board](http://academy.cba.mit.edu/classes/embedded_programming/index.html#echo)
 based on the guidelines of the
 [electronics design](http://academy.cba.mit.edu/classes/electronics_design/index.html)
-assignment.
+assignment. Others involve bit-banging a serial connection to a computer using an FTDI
+friend.
 
 Read the comments in the Makefile for instructions on building and using this
 code.