1.2.0
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* [clear cache after update_counters](https://github.com/csdn-dev/second_level_cache/commit/240dde81199124092e0e8ad0500c167ac146e301)

1.2.1
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* [fix polymorphic association bug]

1.3.0
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* [clean cache after touch]

1.3.1
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* [clean cache after update_column/increment!/decrement!]

1.3.2
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* [fix has one assciation issue]

1.4.0
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* [cache has one assciation]

1.4.1
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* [fix errors when belongs_to association return nil]

1.5.0
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* [add cache version to quick clear cache for special model]

1.5.1
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* [use new marshal machanism to avoid clear assocation cache manually]