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**Added**
- The `language_info` section is not part of the default header any more. Language information is now taken from metadata `kernelspec.language`. ([105](https://github.com/mwouts/jupytext/issues/105)).
- When opening a paired notebook, the active file is now the file that was originally opened ([118](https://github.com/mwouts/jupytext/issues/118)). When saving a notebook, timestamps of all the alternative representations are tested to ensure that Jupyter's autosave does not override manual modifications.
- Jupyter magic commands are now commented per default in the `percent` format ([126](https://github.com/mwouts/jupytext/issues/126), [#132](https://github.com/mwouts/jupytext/issues/132)). Version for the `percent` format increases from '1.1' to '1.2'. Set an option `comment_magics` to `false` either per notebook, or globally on Jupytext's contents manager, or on `jupytext`'s command line, if you prefer not to comment Jupyter magics.
- Jupytext command line has a pre-commit mode ([121](https://github.com/mwouts/jupytext/issues/121)).