v0.3.4.6

This release includes new features such as support for lists and tuples for nested higher order operators, schema validation changes to expect separate schemas for transform and predict and to allow more flexible schemas ('laleType':'any'), documentation updates and ability to generate
doc strings from schemas, fixes and updates to dependencies, fixes and updates to import and export from and to scikit-learn pipelines. It also includes bug fixes and enhancements to visualization, pretty_print, operator schemas, optimizer wrappers etc.