Robot Framework 3.1 is a new major release with Robotic Process Automation (RPA) support, automatic argument type conversion, support for named-only arguments, for loop enhancements, fix for intermittent corruption of `output.xml` files when using timeouts, and several other interesting new features and as various bug fixes. It also starts the deprecation process to remove the support of using test data in HTML format and making test data parsing more strict also otherwise.
For more information see the [full release notes](https://github.com/robotframework/robotframework/blob/master/doc/releasenotes/rf-3.1.rst).