Adjusted the makefile and example main

for some odd reason the main file in the makefile was set to main.c not main.cpp  corrected this as there is no main.c anywhere in this repo. Also removed references to HardwareUsb.h, since those files dont exist yet (the originals were depricated and removed)

1 files changed, 1 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index 0643359..cd03356 100644
--- a/Makefile
+++ b/Makefile
@@ -59,7 +59,7 @@ CPFLAGS = -v -Obinary
 ODFLAGS = -S
 
 # main source file
-MAIN=main.c
+MAIN=main.cpp
 
 CSRC = libmaple/systick.c                \
        libmaple/timers.c                 \