Lyrics::Fetcher::LyricWiki updated

LyricWiki.org used to provide the ability to retrieve lyrics via an API, which was handy.

Recently, LyricWiki effectively ceased, but the project and all the contributed lyrics so far were migrated to Wikia.

Unfortunately, it seems the record labels demanded that lyrics no longer be available via the API, and can only be served up on a web page.

Therefore, I’ve updated Lyrics::Fetcher::LyricWiki appropriately.