0.1.0
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* Improvement: deferred setup to avoid side-effects upon import
* Improvement: raise exception when missing smbus, rather than hard exit()
* BugFix: fixed print_str not blanking unused characters

0.0.2
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* New: set_blink method to enable built-in blink
* New: set_brightness method to change display brightness
* New: glow method for glowing/pulsing effects
* New: print_scroll method for scrolling text
* Improvement: speed optimisation by switching to block i2c write

0.0.1
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* Initial release

