Added note to PWM readme

ZoranStojsavljevic · May 20, 2019 · f83bc2d · f83bc2d
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diff --git a/chp06/pwm/README b/chp06/pwm/README
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+Warning: This code is related to Revision 1 of EBB, not Revision 2. The code would 
+have to be adapted for the new file paths that are set by config-pin and the note 
+below on $SLOTS is no longer relevant.
+
 An example to use the PWM class on a PWM pin -- See pages 232-233 in the book 
 Exploring BeagleBone by Derek Molloy