Update ruby-sequel to 4.37.0.

=== 4.37.0 (2016-08-01)

* Add support for regular expression matching on Oracle 10g+ using REGEXP_LIKE (johndcaldwell) (#1221)

* Recognize an additional disconnect error in the postgres adapter (jeremyevans)

* Make connection pool remove connections for disconnect errors not raised as DatabaseDisconnectError (jeremyevans)

* Support mysql2 0.4+ native prepared statements and bound variables (jeremyevans)

* Add Database#values for VALUES support on SQLite 3.8.3+ (jeremyevans)

* Support create_view :columns option on SQLite 3.9.0+ (jeremyevans)

* Make migration reverser handle alter_table add_constraint using a hash as the first argument (soupmatt) (#1215)

* Make ASTTransformer handle Sequel.extract (jeremyevans) (#1213)

(taca)