New features
[5e0b275] Use the String component (@javiereguiluz)
[2227440] Use new functional test specific assertions (@voronkovich)
[177b652] Use short syntax for routes HTTP methods (@voronkovich)
[e01aebb] Replaced SwiftMailer by Symfony Mailer (@javiereguiluz)
[17bf17b] Made blog post titles unique (@javiereguiluz)
[5eae5f2] Validate Composer files while TravisCI build (@voronkovich)
[d94fcc8] Required symfony/apache-pack package (@bocharsky-bw)
[e2944ce] Updated tgalopin/html-sanitizer to remove Intl extension requirement (@tgalopin)
Bug fixes
[4e1522b] Fixed broken links (@voronkovich)
[7cbada1] Made tests compatible with PHPUnit 8 (@voronkovich)
[4966423] Removed "symfony/polyfill-php72" from the dependencies (@rosier)
[3abd67a] Use a more friendly message about hardcoding user details (@pierredup)
[4016b3c] Add a translation for a message about slug uniqueness (@voronkovich)
[3b68b6d] Updated Ukrainian translation (@bocharsky-bw)
[0583b4d] Updated Russian translation (@Coderberg)