Fix potential regression introduced when fixing PHP-DI#582

See PHP-DI@1a46970#r28689040

> The caller might expect to receive an object that is `instanceof Container`.

Update the README image to high resolution

Update 6.0 changelog to link to the news article

Merge pull request PHP-DI#569 from PHP-DI/567-silence-some-errors-at-…

…compilation

Fix PHP-DI#567 Ignore errors for invalid referenced definitions during compilation

Improve gitstats config

See https://github.com/mnapoli/gitstats

Update the changelog for 5.4.x versions

Update the changelog for 5.4.x versions

Remove HHVM tests

Remove unnecessary line following merging PHP-DI#545

Merge pull request PHP-DI#507 from PHP-DI/compile-factories

Compile factories, including closures