64x32 displays skip every other horizontal row

[adamcandy]

Fantastic this library presents a straightforward and easy interface to these displays.
In the case of the smaller 64x32 ssd1306-based OLED displays, it is not possible to use half of the rows (every other row is skipped).

[adamcandy]

This issue is fixed with the pull request #53

[adamcandy]

Fix in #53 has been merged in -- thanks for getting this in quick @tannewt!