Git-edit-index

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* FEA: Added support for deleting symlinks
([087acf7](https://github.com/s3rvac/git-edit-index/commit/087acf75fc169a8c54e71befb124546261d6a723)).
* DEL: Dropped official support for Python 3.5 and 3.6 as [they are
EOL](https://devguide.python.org/#branchstatus).

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

* FEA: Added support for staging ignored files
([9](https://github.com/s3rvac/git-edit-index/pull/9)). To show ignored
files, you need to run `git edit-index` with the `--ignored` parameter.
* DEL: Dropped official support for Python 3.2, 3.3, and 3.4 as [they are
EOL](https://devguide.python.org/#branchstatus).

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* FIX: Fixed `TypeError: fdopen() takes no keyword arguments` when running the
command via Python 2.7
([3](https://github.com/s3rvac/git-edit-index/issues/3)).

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

* FIX: Fixed the opening of the editor on Windows. Due to file locking on
Windows, we need to write the index and close the temporary file before we
open the editor. Otherwise, the editor is not able to read or change the
file.

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

* FEA: When the editor buffer is empty (i.e. all lines were deleted), the
command now asks the user whether he or she wants to reflect the changes
([1](https://github.com/s3rvac/git-edit-index/issues/1)). This makes the
deletion of files or changes more foolproof. The default behavior can be
changed by setting the `onEmptyBuffer` config option (see the `README` file
for more details).
* FIX: Do not print a backtrace when an external command (e.g. `git`) fails.
That only clutters the screen, thus making the real error printed by the
external command less apparent.

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

* FEA: Changing file status from `M` or `D` to `P` runs `git add --patch FILE`.
* FEA: Changing file status from `D` to `P` runs `git reset --patch FILE`.
* FEA: Added the script to PyPI so it can be installed via `pip install
git-edit-index`.
* FIX: Fixed unit tests under Python 2 and PyPy.