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