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Features
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* Add error message for missing configuration (Thanks: jashgala)
* Add colors and pager to config file (Thanks: zzl0)
Internal
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* Updated docs (Thanks: jashgala)
* Add support for pipenv (Thanks: Hourann)
* Set poll_interval of PyAthena to 0.2s, this will reduce the response time (Thanks: zzl0)
* Add developer guide (Thanks: zzl0)