Thanks for fixing this, Derek!
I did notice this line in the notes for 1.5: ''Familiars will not get bonus levels if their summoner get bonus levels on his summons''
As far as I know, those Summons never had extra levels? At least not in my last 1.4 game. Or did you change that after reading this post, and removed it again directly afterwards?
While bonus levels might be cool, they could be OP. With your fix, the Familiar is not exactly useless, but still underwhelming. A speed of 3, preferably 4 or 5, would give it some actual use.