Update README.md

cho45 · Aug 9, 2019 · 186c5d2 · 186c5d2
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 # HackRF Sweep WebUSB
 
-This is spectrum analyzer implementation in JavaScript with WebUSB for <a href="https://greatscottgadgets.com/hackrf/">HackRF</a>.
+This is a spectrum analyzer implementation in JavaScript with WebUSB for <a href="https://greatscottgadgets.com/hackrf/">HackRF</a>.
 
 <img src="./doc/dfe049fbba1adc9c9e0e21e2449f72cd.gif">