Aroksak

Reset & exception vectors missing when building 05_led_roulette

2

Hi! Neither led roulette nor cortex-m-quickstart build for me with the following, with both `nightly-2018-08-17` and `nightly-2018-06-28`: ``` $ cargo build --target thumbv7em-none-eabihf ... /usr/lib/gcc/arm-none-eabi/6.3.1/../../../arm-none-eabi/bin/ld: BUG(cortex-m-rt): the reset vector is...