Update Makefile

Corrected spelling of "ATREUS" in all locations. (ATRUES -> ATREUS)

keyboards/atreus/Makefile

@@ -2,11 +2,11 @@
 
 ifdef TEENSY2
     OPT_DEFS += -DATREUS_TEENSY2
-    ATRUES_UPLOAD_COMMAND = teensy_loader_cli -w -mmcu=$(MCU) $(TARGET).hex
+    ATREUS_UPLOAD_COMMAND = teensy_loader_cli -w -mmcu=$(MCU) $(TARGET).hex
 else
     OPT_DEFS += -DATREUS_ASTAR
     OPT_DEFS += -DCATERINA_BOOTLOADER
-    ATRUES_UPLOAD_COMMAND = while [ ! -r $(USB) ]; do sleep 1; done; \
+    ATREUS_UPLOAD_COMMAND = while [ ! -r $(USB) ]; do sleep 1; done; \
                             avrdude -p $(MCU) -c avr109 -U flash:w:$(TARGET).hex -P $(USB)
 endif
 
@@ -84,5 +84,5 @@ endif
 USB ?= /dev/cu.usbmodem1411
 
 upload: build
-	$(ATRUES_UPLOAD_COMMAND)
-	
+	$(ATREUS_UPLOAD_COMMAND)
+