Update activerecord requirement from <= 2.8.0 to <= 6.1.0

[dependabot]

Updates the requirements on activerecord to permit the latest version.

Release notes

Sourced from activerecord's releases.

6.0.0.beta1

Active Support

• Remove deprecated Module#reachable? method.

  Rafael Mendonça França

• Remove deprecated #acronym_regex method from Inflections.

  Rafael Mendonça França

• Fix String#safe_constantize throwing a LoadError for incorrectly cased constant references.

  Keenan Brock

• Preserve key order passed to ActiveSupport::CacheStore#fetch_multi.

  fetch_multi(*names) now returns its results in the same order as the *names requested, rather than returning cache hits followed by cache misses.

  Gannon McGibbon

• If the same block is included multiple times for a Concern, an exception is no longer raised.

  Mark J. Titorenko, Vlad Bokov

• Fix bug where #to_options for ActiveSupport::HashWithIndifferentAccess
  would not act as alias for #symbolize_keys.

  Nick Weiland

• Improve the logic that detects non-autoloaded constants.

  Jan Habermann, Xavier Noria

• Deprecate ActiveSupport::Multibyte::Unicode#pack_graphemes(array) and ActiveSuppport::Multibyte::Unicode#unpack_graphemes(string)
  in favor of array.flatten.pack("U*") and string.scan(/\X/).map(&:codepoints), respectively.

  Francesco Rodríguez

• Deprecate ActiveSupport::Multibyte::Chars.consumes? in favor of String#is_utf8?.

  Francesco Rodríguez

• Fix duration being rounded to a full second.

    time = DateTime.parse("2018-1-1")
    time += 0.51.seconds
  

  Will now correctly add 0.51 second and not 1 full second.

... (truncated)

Changelog

Sourced from activerecord's changelog.

Rails 6.0.0 (August 16, 2019)

• Preserve user supplied joins order as much as possible.

  Fixes #36761, #34328, #24281, #12953.

  Ryuta Kamizono

• Make the DATABASE_URL env variable only affect the primary connection. Add new env variables for multiple databases.

  John Crepezzi, Eileen Uchitelle

• Add a warning for enum elements with 'not_' prefix.

  class Foo
    enum status: [:sent, :not_sent]
  end
  

  Edu Depetris

• Make currency symbols optional for money column type in PostgreSQL

  Joel Schneider

Rails 6.0.0.rc2 (July 22, 2019)

• Add database_exists? method to connection adapters to check if a database exists.

  Guilherme Mansur

• PostgreSQL: Fix GROUP BY with ORDER BY virtual count attribute.

  Fixes #36022.

  Ryuta Kamizono

• Make ActiveRecord ConnectionPool.connections method thread-safe.

  Fixes #36465.

  Jeff Doering

• Fix sqlite3 collation parsing when using decimal columns.

  Martin R. Schuster

• Fix invalid schema when primary key column has a comment.

  Fixes #29966.

... (truncated)

Commits

• 66cabed Preparing for 6.0.0 release
• f63df2b Merge pull request #36949 from 97jaz/thread-local-prepared-statements
• 92784ad Nodoc class that should not be part of public API
• 4f912de Merge pull request #36873 from jhawthorn/schema_sha_parallel
• 0169c93 Merge pull request #36883 from jhawthorn/schema_sha_fix
• c550e71 Merge pull request #36870 from jhawthorn/schema_sha
• 26ab0ad Merge pull request #36848 from jhawthorn/type_error_on_resolve_connection
• 80c1f15 Restore an ability that reorder with first taking non-deterministic result
• eae97cd Fix typo in test name
• c5b68fb Merge pull request #36863 from okuramasafumi/add-explanation-of-context-to-ac...
• Additional commits viewable in compare view

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[dependabot]

Superseded by #8.