BUG: Fix typo in parsers.py
closes #9266 

np.uin8 should be np.uint8

Looks like this code path was never tested then :laughing: @twu interested in writing a test that _does_ cause cause a `ValueError` here?
 this is already partially done in #9350 

just need a complete test

pls feel free to lift that code and complete. Ideally we'd like to do this for 0.16.1, releasing in next couple of days.
 closing in favor of #9350 
