Use _ instead of nil to denote missing short option (updates #130)
Use _ instead of nil to denote missing short option (updates #130)

upgradingdave/boot,danielsz/boot,crisptrutski/boot,crisptrutski/boot,RadicalZephyr/boot,junjiemars/boot,boot-clj/boot,tobias/boot,ragnard/boot,RadicalZephyr/boot,instilled/boot,crisptrutski/boot,tobias/boot,danielsz/boot,ragnard/boot,instilled/boot,junjiemars/boot,junjiemars/boot,bbatsov/boot,tobias/boot,kennyjwilli/boot,kausdev/boot,kausdev/boot,upgradingdave/boot,kausdev/boot,upgradingdave/boot,kennyjwilli/boot,ragnard/boot,danielsz/boot