added an UPGRADE file

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Fabien Potencier 2011-10-08 18:29:31 +02:00
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UPGRADE-2.1.md Normal file
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UPGRADE FROM 2.0 to 2.1
=======================
* assets_base_urls and base_urls merging strategy has changed
Unlike most configuration blocks, successive values for
``assets_base_urls`` will overwrite each other instead of being merged.
This behavior was chosen because developers will typically define base
URL's for each environment. Given that most projects tend to inherit
configurations (e.g. ``config_test.yml`` imports ``config_dev.yml``)
and/or share a common base configuration (i.e. ``config.yml``), merging
could yield a set of base URL's for multiple environments.