Features
* Added `.read` command for reading scripts.
* Added `.load` command for loading extension libraries. (Thanks: [Zhiming Wang])
* Add support for using `?` as a placeholder in the favorite queries. (Thanks: [Amjith])
* Added shift-tab to select the previous entry in the completion menu. [Amjith]
* Added `describe` and `desc` keywords.
Bug Fixes
* Clear error message when directory does not exist. (Thanks: [Irina Truong])