Jupysql

* Adds example for connecting to a SQLite database with spaces ([35](https://github.com/ploomber/jupysql/issues/35))
* Documents how to securely pass credentials ([40](https://github.com/ploomber/jupysql/issues/40))
* Adds `-a/--alias` option to name connections for easier management ([59](https://github.com/ploomber/jupysql/issues/59))
* Adds `%sqlplot` for plotting histograms and boxplots
* Adds missing documentation for the Python API
* Several improvements to the `sql.plot` module
* Removes `six` as dependency (drops Python 2 support)

* Allow to connect to databases with an existing `sqlalchemy.engine.Engine` object

* `ResultSet.plot()`, `ResultSet.bar()`, and `ResultSet.pie()` return `matplotlib.Axes` objects

* Assigns a variable without displaying an output message ([13](https://github.com/ploomber/jupysql/issues/13))

* Updates telemetry key

* Adds anonymous telemetry