Merge pull request rails#9605 from neerajdotname/sqlite-support-savepoint

SQLite3 3.6.8+ supports savepoints

Author: carlosantoniodasilva

activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb

@@ -125,7 +125,8 @@ def supports_statement_cache?
       # In order to get around this problem, #transaction will emulate the effect
       # of nested transactions, by using savepoints:
       # http://dev.mysql.com/doc/refman/5.0/en/savepoint.html
-      # Savepoints are supported by MySQL and PostgreSQL, but not SQLite3.
+      # Savepoints are supported by MySQL and PostgreSQL. SQLite3 version >= '3.6.8'
+      # supports savepoints.
       #
       # It is safe to call this method if a database transaction is already open,
       # i.e. if #transaction is called within another #transaction block. In case