Use more up-to-date feedparser

See #9.

This reverts commit 49d173a65629046aaaa99a9da6d447940f25961c, which
reverted 4249940161e5a8714a2f268b5107a8c9ad73209a.

So, this is restoring 4249940161e5a8714a2f268b5107a8c9ad73209a.
Make Travis install dev deps, try number 1