Bump to 0.8.8

Including a few last-minute CHANGELOG tweaks
Allow soundcloud https oembeds

soundcloud is using https a lot in their new site and their
oembed endpoint supports it, commit adds support for that.
Merge pull request #30 from Ruxton/patch-1

OEmbed::Providers::SoundCloud accepts https URLs
Update Changelog based on Pull #30
Correct version number in the Changelog

This is what I get for committing via GitHub's web UI :-)