PHP 7 migration

PHP 5 no longer supported : #124
Rules no longer returns DomElement : #121
Strict mode in every classes : #123
Update to PHPUnit 6 : #128
Specify return types in all methods : #136

Yahoo! media thumbnails

detect media:thumbnail as medias if present #140

Ability to force the feed's timezone if missing from the stream

Now we can force the feed's timezone : #134

medias inclusion in Atom stream

medias are now correctly embedded in Atom feeds #131

Fix body size detection

Use ->getBody()->getSize() instead of strlen() which can be buggy : #122

multiple categories writing - 304 status support

The Formatter now writes all categories : #106
The Feed is empty if the HTTP response's status is 304 : #109 , #119

Atom's date format, Guzzle Factory, Feed implements Countable and php-cs-fixer

Date format was not compliant with Atom's standard : #102
Configuration was not passed to Guzzle through the Factory : #107
\FeedIo\Feed now implements \Countable : #110
The project is now PSR-2 compliant : #115

Thanks to @shavounet and @mirfilip

Fix crash when lastModified attribute is missing

v3.0.1

Update specifications-support.md

JSON Feed support

feed-io now supports JSON Feed as specified on https://jsonfeed.org/version/1

HTML special chars decoding

feed-io now decodes HTML special chars in the description