blink method should preserve brightness

[eadmaster]

the blink method should preserve the current brightness rather than resetting to 100.
This way if i reduce the brightness before the calling "begin()" it is not reset.

[bremme]

Thanks for reporting this issue, I agree! This should not be that hard to add to the library. Update: I just fixed it by this commit 019612d. I probably should update the README as well, the full signature for the blink() method is:

void    blink(uint8_t blinkDelay = TM1637_DEFAULT_BLINK_DELAY, uint8_t repeats = TM1637_DEFAULT_BLINK_REPEAT, uint8_t maxBacklight=100, uint8_t minBacklight=0);

So you can set the following blink options: delay (how long on/off time in ms), repeats, maxBacklight (how bright is on) and minBacklight (how bright is off).

Hope this helps, closing this issue for now.