Bump sequel from 5.19.0 to 5.20.0

[dependabot-preview]

Bumps sequel from 5.19.0 to 5.20.0.

Changelog

Sourced from sequel's changelog.

=== 5.20.0 (2019-05-01)

• Fix reversing of alter_table add_foreign_key when :type option is used (jeremyevans) (#1615)

• Switch from using instance_exec to define_method for model associations and in some plugins (jeremyevans)

• Fix Database#server_version when using mysql2 adapter with mysql driver on MariaDB 10+ database (v-kolesnikov) (#1614)

• Make one_to_one setter method handle models that use joined datasets (jeremyevans) (#1612)

• Make auto_validations plugin work with the class_table_inheritance plugin (jeremyevans) (#1611)

• Avoid use of instance_exec for PlaceholderLiteralString#with_dataset (jeremyevans)

• Recognize float unsigned database types as float (keeguon, jeremyevans) (#1609)

• Support :savepoint options to Database#{after_commit,after_rollback} for making the hooks handle savepoints (jeremyevans)

• Avoid use of instance_exec in association_dependencies plugin (jeremyevans)

• Add pg_auto_constraint_validation_override to the pg_auto_constraint_validations plugin, for customizing columns and error message per constraint (jeremyevans)

• Make Database#check_constraints on PostgreSQL also include constraints where the related columns are not known (jeremyevans)

Commits

• 31ae7dc Bump version to 5.20.0
• b731bc9 Fix reversing of alter_table add_foreign_key when :type option is used (Fixes...
• 6eca000 Switch from using instance_exec to define_method for model associations and i...
• ab945f0 Update CHANGELOG
• 66758bb Fix Mysql2::Database#server_version method
• 40d00b2 Fix class_table_inheritance with auto_validations to work with subclass columns
• cc3e2fb Make one_to_one setter method handle models that use joined datasets (Fixes #...
• 9f401ec Make auto_validations plugin work with the class_table_inheritance plugin (Fi...
• c6debc1 Fix a typo in the error message
• a749cb1 Avoid unnecessary use of module_eval
• Additional commits viewable in compare view

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