some minor cleanup

src/main.cpp

@@ -27,8 +27,6 @@ DFPlayer - A Mini MP3 Player For Arduino
 SoftwareSerial softSerial(/*rx =*/4, /*tx =*/5);
 #define FPSerial softSerial
 #elif (defined(ARDUINO_attinyxy4))
-// #include <SoftwareSerial.h>
-// SoftwareSerial softSerial(PIN_PB2, PIN_PB3);
 #define FPSerial Serial
 #else
 #define FPSerial Serial1
@@ -56,7 +54,6 @@ SoftwareSerial softSerial(/*rx =*/4, /*tx =*/5);
 Ultrasonic rf(TRIGGER, ECHO, 40000UL);
 #endif
 
-// bool last=true;
 bool playing=true;
 bool in_range=false;
 DFRobotDFPlayerMini myDFPlayer;