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Anonymous committed 2777844

update 4.0 release notes to reflect the removal of auto explain.

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guides/source/4_0_release_notes.md

 
 *   Remove IdentityMap.
 
+*   Remove automatic execution of EXPLAIN queries. The option `active_record.auto_explain_threshold_in_seconds` is no longer used and should be removed.
+
 *   Adds `ActiveRecord::NullRelation` and `ActiveRecord::Relation#none` implementing the null object pattern for the Relation class.
 
 *   Added `create_join_table` migration helper to create HABTM join tables.