UPGRADE.md in quandl_logger-0.2.6 vs UPGRADE.md in quandl_logger-0.3.1

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+## 0.3.1 
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+## 0.3.0 
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+## 0.2.0 
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+## 0.1.0 
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+* QUGC-189 logger does not require core_ext object
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 ## 0.2.5
 
 * dont automatically require graylog2
 
 
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