Fix: linking for devices without bootloader

[Derisis13]

I used this repository as a template for my latest project, where I programmed an AVR microcontroller without any bootloader. For days I couldn't tell why my code compiled but when run didn't do anything. Then a friend of mine brought to my attention that in case of flashing without a bootloader an extra objectcopy is required to set up the interrupt vectors as well as the reset vector, as you can see in this example: https://blog.podkalicki.com/how-to-compile-and-burn-the-code-to-avr-chip-on-linuxmacosxwindows/
I don't know if the way I implemented it makes sense at all, but it works. I just hope I can take away some of the frustration of the next person trying to figure out why their code is not working.

[Derisis13]

Also the path to the avr-objdump executable is a bluff on my part, I run linux on my machine. I could very well be wring on that one.