Release 8.6.0

Changelog :

• Add support of Ruby 2.7

Notes :

• This is the last version to support Ruby 2.4.x
• This is the last version to support Rails 5.0.x

Release 8.5.0

Changelog:

• Drop support of Ruby 2.2
• Drop support of Ruby 2.3
• Add support of Ruby 2.6
• Add support of Rails 6.x
• Switch to Zeitwerk to load gem files

Release 8.4.0

Changelog:

• Set custom UserAgent in check_rails script (thanks to @n-rodriguez).