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Features
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* Added DSN alias name as a format specifier to the prompt (Thanks: [Georgy Frolov]).
* Mark `update` without `where`-clause as destructive query (Thanks: [Klaus Wünschel]).
* Added DELIMITER command (Thanks: [Georgy Frolov])
* Added clearer error message when failing to connect to the default socket.
* Extend main.is_dropping_database check with create after delete statement.
* Search `${XDG_CONFIG_HOME}/mycli/myclirc` after `${HOME}/.myclirc` and before `/etc/myclirc` (Thanks: [Takeshi D. Itoh])
Bug Fixes
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* Allow \o command more than once per session (Thanks: [Georgy Frolov])
* Fixed crash when the query dropping the current database starts with a comment (Thanks: [Georgy Frolov])
Internal
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* deprecate python versions 2.7, 3.4, 3.5; support python 3.8