Jupytext

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**Added**

- The documentation includes a mention on how to set metadata filters at the command line ([330](https://github.com/mwouts/jupytext/issues/330))
- Jupytext will not catch any error when the flag `--warn-only` is not set ([327](https://github.com/mwouts/jupytext/issues/327))

**Fixed**

- Now the flag `--warn-only` catches every possible error ([263](https://github.com/mwouts/jupytext/issues/263))
- `.md` and `.markdown` files are treated identically ([325](https://github.com/mwouts/jupytext/issues/325))
- Fixed `--set-kernel` when using pipes ([326](https://github.com/mwouts/jupytext/issues/326))
- Fixed utf-8 encoding on stdout on Python 2 ([331](https://github.com/mwouts/jupytext/issues/331))

------------------

**Fixed**

- Dependency on `setuptools` in `pandoc.py` made optional to fix the build of the conda package ([310](https://github.com/mwouts/jupytext/issues/310), [#323](https://github.com/mwouts/jupytext/issues/323))

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**Added**

- Documentation includes a section on how to use Jupytext as a Python library ([317](https://github.com/mwouts/jupytext/issues/317))
- Mention of the server extension in the documentation ([304](https://github.com/mwouts/jupytext/issues/304))
- Text notebooks can be tested with `jupytext --execute notebook.md` ([303](https://github.com/mwouts/jupytext/issues/303))
- The default value of `as_version` in `jupytext.read` is `nbformat.NO_CONVERT`, as for `nbformat.read`
- Jupytext tests are now included in sdist ([310](https://github.com/mwouts/jupytext/issues/310))

**Fixed**

- Fixed the usability of the `fmt` argument in `jupytext.read` ([312](https://github.com/mwouts/jupytext/issues/312))
- Fixed the download notebook error when `c.notebook_extensions` has a custom value ([318](https://github.com/mwouts/jupytext/issues/318))
- String delimiters in commented text are now ignored ([307](https://github.com/mwouts/jupytext/issues/307))

------------------

**Added**

- Added documentation on how to use Jupytext with JupyterLab 0.35 ([299](https://github.com/mwouts/jupytext/issues/299))
- and on using Jupytext with the pre-commit package manager ([292](https://github.com/mwouts/jupytext/issues/292))
- The `read` and `write` functions are easier to use ([292](https://github.com/mwouts/jupytext/issues/292))

**Fixed**

- Jupytext now ships the `jupyterlab-jupytext` extension in version 1.0.2. The version 1.0.1 erroneously introduces a `target_formats` metadata in the jupytext section, instead of `formats`, and works only after two clicks.

------------------

**Added**

- New `--execute` option in Jupytext CLI ([231](https://github.com/mwouts/jupytext/issues/231))
- The `--set-formats` option in Jupytext CLI also triggers `--sync`, allowing shorter commands.
- `jupytext`'s `read` and `write` functions can be used as drop-in replacements for `nbformat`'s ones ([262](https://github.com/mwouts/jupytext/issues/262)).
- `jupytext --sync` will now skip unpaired notebooks ([281](https://github.com/mwouts/jupytext/issues/281)).
- The JupyterLab extension was updated. It now works on on text files ([213](https://github.com/mwouts/jupytext/issues/213)) and has a new option to include
(or not) the metadata in the text representation of the notebook.
- Jupytext's contents manager class is derived dynamically from the default CM class for compatibility with
`jupyter_server` ([270](https://github.com/mwouts/jupytext/issues/270))
- Removed dependency on `mock` and `testfixtures`, thanks to Jean-Sebastien Dieu ([279](https://github.com/mwouts/jupytext/issues/279))
- Added support for `.markdown` extension ([288](https://github.com/mwouts/jupytext/issues/288))

**Fixed**

- The `jupyterlab-jupytext` extension shipped with the python package is in version 1.0.1, and is compatible only
with JupyterLab >= 1.0. If you use an earlier version of JupyterLab, please install the version 0.19 of the extension
with `jupyter labextension install jupyterlab-jupytext0.19` ([276](https://github.com/mwouts/jupytext/issues/276), [#278](https://github.com/mwouts/jupytext/issues/278))
- Text files can be unpaired ([289](https://github.com/mwouts/jupytext/issues/289))

------------------

**Added**

- Added support for Scala notebook, by Tobias Frischholz ([253](https://github.com/mwouts/jupytext/issues/253))
- Added a getting started notebook for jupytext (and Binder), by Chris Holdgraf ([257](https://github.com/mwouts/jupytext/issues/257))
- The Markdown and R Markdown representations are now tested for all the languages
- The Jupytext notebook extension also works when the notebook is a text file ([213](https://github.com/mwouts/jupytext/issues/213))


**Fixed**

- The Jupytext Menu in Jupyter Notebook is now compatible with `jupyter_nbextensions_configurator` ([178](https://github.com/mwouts/jupytext/issues/178))
- Entries in the Jupytext menu are updated when the menu is hovered on ([248](https://github.com/mwouts/jupytext/issues/248))
- Fixed link to `.md` files in the documentation ([255](https://github.com/mwouts/jupytext/issues/255))