Remove pypandoc & semantic_version dependencies for installing

[maphew]

As of March 16, 2018, PyPI.org aka Warehouse (finally) supports Markdown in long descriptions. Warehouse replaced the old legacy PyPI implementation in April 2018.
-- https://stackoverflow.com/a/26737258/14420
-- pypa/packaging-problems#46
-- https://dustingram.com/articles/2018/03/16/markdown-descriptions-on-pypi

This means we can get rid of the pypandoc foofaraw in setup.py and keep it in plugins where it belongs (and can be incredibly useful).

[maphew]

applied in 0ac02d7. Travis is happy, but it's not until we try a PyPi release that we'll know

[maphew]

Other post successful-pypi-from-travis todo:

• remove semantic_version dependency from pyproject.toml, setup.py (in several places)

[edreamleo]

On Sun, Oct 14, 2018 at 5:39 PM matt wilkie ***@***.***> wrote: Other post successful-pypi-from-travis todo: - remove semantic_version dependency from pyproject.toml, setup.py (in several places) Thanks for this continuing work. Do you have any idea why removing

leo/external/rope would cause TravisCI to fail? All of Leo's unit tests pass. Edward

[maphew]

Closing. Pypandoc was removed a few months ago and semantic_version this week.