python3: add supported python versions to setup.py
Mercurial technically can support Python 3.5 (although no lower, see its
setup.py), but `evolve` probably won't because it represents more work
for an underrepresented Python version. If you happen to *really* need
evolve to work on Python 3 and you're reading this message, send an email
to the mailing list, or contribute patches.
Doc is generated with sphinx.
You can generate the doc with:
```
make
```
# Tutorials
For updating the tutorials, you need to have the docgraph extension installed
(https://pypi.python.org/pypi/hg-docgraph).
Then run the test-topic-tutorial.t and test-tutorial.t to update the output if
needed.
You'll need the dot binary (likely installed by the graphviz package in your
package manager) in order to have graphviz graphs rendered in the html output.
Simply run make in the docs directory should takes care of the conversion of
the tutorial .t files into .rst files. Then sphinx should do the rest of the
jobs by rendering graphviz graphs.