v0.3.0: Adapt progress bar size to fit screen

Adaptative progress-bar

Allows to set duration higher than width of shell size. Thanks @scheleon for his work on #7

v0.2.0: Speed up progress

Speed up progress

Introduce a SLEEP_DURATION variable to speed up progress-bar during test ;

export SLEEP_DURATION=.1
source ./progress-bar.sh
progress-bar 10