v2.0.0

Added

• Support for Atom feeds
• Tests for newly introduced feeds: RSSFeed and AtomFeed
• Ability to retrieve an article's original XML with Article::xml() thanks to @GertSallaerts #14

Changed

• Feed has been split into RSSFeed and AtomFeed - self-factorising objects that will be returned when calling RSS::feed
• Updated PHPUnit to v7 (last version supporting php 7.1)
• Updated code for PHP 7.1

Fixed

• Accessing enclosure attribute in Article @GertSallaerts #14