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Add upgrade guide

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jgrau 2017-05-25 09:08:37 +02:00
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# Upgrade guide
## v1.5.1 -> v1.5.2
Version 1.5.2 adds are new column to the `impressions` table. If you're on v1.5.1 you need to manually add the new column using
```
add_column :impressions, :params, :text
add_index :impressions, [:impressionable_type, :impressionable_id, :params], :name => "poly_params_request_index", :unique => false
```
before upgrading.