DOC/BUG:Added Missing Semicolon to Release Note v0.15
Missed a semi-colon, here's the fix.

yep, thanks
 Dang, I just noticed a bunch more. I'll go ahead and fix them all and send it up in another.
 ok, sure.
see here for how to rebase/squash: https://github.com/pydata/pandas/issues/8502
