update copyright dates from daily grunt work

phetsims · May 26, 2021 · d8a8477 · d8a8477
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diff --git a/js/sound-generators/FourierToneGenerator.js b/js/sound-generators/FourierToneGenerator.js
@@ -1,4 +1,4 @@
-// Copyright 2020, University of Colorado Boulder
+// Copyright 2020-2021, University of Colorado Boulder
 
 /**
  * FourierToneGenerator is a set of oscillators that play simultaneously and whose output levels can be independently

diff --git a/js/sound-generators/OscillatorSoundGenerator.js b/js/sound-generators/OscillatorSoundGenerator.js
@@ -1,4 +1,4 @@
-// Copyright 2020, University of Colorado Boulder
+// Copyright 2020-2021, University of Colorado Boulder
 
 /**
  * OscillatorSoundGenerator is a Web Audio oscillator node wrapped in a sound generator so that it can be easily be used