Version 1.3.4

Added

• C# and F# Jupyter notebooks are now supported (#427, #429)

Fixed

• jupytext --to script *.ipynb now computes the script extension for each notebook (#428)
• Fix shebang handling for languages with non-# comments, by Jonas Bushart (#434)
• Indented bash commands are now commented out (#437)
• The main formats are documented in jupytext --help (#426, #433)