Log Message:
databases/ruby-sequel: update to 5.31.0

Update ruby-sequel to 5.31.0.

=== 5.31.0 (2020-04-01)

* Fix alter_table drop_constraint :primary_key option on SQLite for non-integer \ 
primary keys (jeremyevans)

* Add skip_saving_columns plugin, which supports columns to skip when saving, \ 
and skips generated columns by default (joeosburn, jeremyevans) (#1681, #1682)

* Add support for creating partitioned tables in PostgreSQL 10+ using \ 
:partition_by and :partition_of options (jeremyevans)

* Dump generated columns as generated columns when using the schema_dumper with \ 
:same_db option on PostgreSQL 12+ (jeremyevans) (#1680)

* Ignore defaults for generated columns by default when using the schema dumper \ 
(jeremyevans) (#1680)

* Include generated columns in schema on SQLite 3.31+ (jeremyevans)

* Add :generated schema entry on PostgreSQL 12+ and SQLite 3.31+ for whether the \ 
columns is generated (jeremyevans)

* Add association_lazy_eager_option plugin for supporting :eager option for \ 
association method (jeremyevans)

* Add forbid_lazy_load plugin for forbidding lazy loading of associations, to \ 
help find N+1 issues (jeremyevans)