Update composer/composer in / from 1.5.2 to 1.5.5

[dependencies]

Dependencies.io has updated composer/composer (a packagist dependency in /) from "1.5.2" to "1.5.5".

1.5.5

• Fixed regression in require command when requiring unstable packages, part 2

1.5.4

• Fixed regression in require command when requiring unstable packages

1.5.3

• Fixed require/remove commands reverting the composer.json change when a non-solver-related error occurs
  • Fixed GitLabDriver to support installations of GitLab not at the root of the domain
  • Fixed create-project not following the optimize-autoloader flag of the root package
  • Fixed Authorization header being forwarded across domains after a redirect
  • Improved some error messages for clarity