Jupytext

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**Added**

- Jupytext now supports Javascript and Typescript, thanks to Hatem Hosny ([250](https://github.com/mwouts/jupytext/issues/250))
- Jupytext works with Python 3.8 as well

**Fixed**

- Fix global `auto` pairing ([249](https://github.com/mwouts/jupytext/issues/249))

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**Fixed**

- Fixed implicit dependency on `jupyter_client` ([245](https://github.com/mwouts/jupytext/issues/245))

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**Added**

- New argument `--set-kernel` in Jupytext command line ([230](https://github.com/mwouts/jupytext/issues/230))
- Jupytext now accepts `--to script` or `--to auto` ([240](https://github.com/mwouts/jupytext/issues/240))
- Jupytext now has a real Sphinx documentation on [readthedocs](https://jupytext.readthedocs.io/en/latest), thanks to Chris Holdgraf ([#237](https://github.com/mwouts/jupytext/issues/237))

**Fixed**

- Invalid notebooks may cause a warning, but not a fatal error ([234](https://github.com/mwouts/jupytext/issues/234))
- Jupyter server extension leaves the contents manager unchanged if it is a sub-class of Jupytext's CM ([236](https://github.com/mwouts/jupytext/issues/236))
- Fixed format inference when metadata is present but not format information ([239](https://github.com/mwouts/jupytext/issues/239))
- Preserve executable and encoding information in scripts with metadata ([241](https://github.com/mwouts/jupytext/issues/241))

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**Added**

- Support for IDL notebooks and .pro scripts ([232](https://github.com/mwouts/jupytext/issues/232))

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**Added**

- Jupytext's content manager has a new `notebook_extensions` option ([224](https://github.com/mwouts/jupytext/issues/224), [#183](https://github.com/mwouts/jupytext/issues/183))
- Cells can be made inactive in scripts with the `active-ipynb` cell tag ([226](https://github.com/mwouts/jupytext/issues/226))

**Fixed**

- Directories ending in .jl (or .ipynb) are not notebooks ([228](https://github.com/mwouts/jupytext/issues/228))
- Empty notebooks have no language ([227](https://github.com/mwouts/jupytext/issues/227))

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**Added**

- Jupytext server extension leaves the contents manager unchanged when it is already a subclass of TextFileContentsManager ([218](https://github.com/mwouts/jupytext/issues/218))
- The base class for TextFileContentsManager defaults to FileContentsManager when LargeFileManager is not available ([217](https://github.com/mwouts/jupytext/issues/217))