Update CHANGELOG. Prepare for v5.0.4

Author: metaskills

CHANGELOG.md

@@ -3,6 +3,7 @@
 #### Fixed
 
 * Allow `datetimeoffset` to be used in migrations and represented in schema.
+* Using transactions and resetting isolation level correctly when `READ_COMMITTED_SNAPSHOT` is set to `ON` Fixes #520
 
 
 ## v5.0.3

lib/active_record/connection_adapters/sqlserver/transaction.rb

@@ -14,7 +14,6 @@ def sqlserver?
       def current_isolation_level
         return unless sqlserver?
         level = connection.user_options_isolation_level
-
         # When READ_COMMITTED_SNAPSHOT is set to ON,
         # user_options_isolation_level will be equal to 'read committed
         # snapshot' which is not a valid isolation level