`-v1` default

[PeterlitsZo]

Hello. Do you think set -v1 as a default mode is a better idea?

When I find that I cannot change my light, I cannot know what happen, and it also do not ask me to use sudo or something else. So I hope you can change the default mode.

[PeterlitsZo]

In file light/helper.h, I think change lines 18-22 to:

typedef enum {
    LIGHT_ERROR_LEVEL = 1,
    LIGHT_WARN_LEVEL,
    LIGHT_NOTE_LEVEL
} light_loglevel_t = LIGHT_ERROR_LEVEL;

is a good idea.

If you think so, I think I can make a PR.