Update README.md

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 This repository contains a single file `Typescript` implementation of General Instrument's [`A-3-8910`](https://en.wikipedia.org/wiki/General_Instrument_AY-3-8910) `PSG` (programmable sound generator) in
 less than `1K` lines and without any magic constants! 
 
-The emulator allows for fine tuning of the DAC look up table though modification of the following variables:
+The emulator allows for fine tuning of the DAC look-up table though modification of the following variables:
 ```
 const DAC_DECAY = 1.3;
 const DAC_SHIFT = 40;