setup: Import version directly.
setup: Import version directly.

In `setup.py` import `__version__` directly from the `version.py` file
rather than importing via the `sphinxcontrib_verilog_diagrams.__init__`
file (which requires sphinx / docutils / other dependencies) to be
available.

Signed-off-by: Tim 'mithro' Ansell <f857bf86f3aed4a1021a5247bd2399c65b7ad5cd@google.com>

SymbiFlow/sphinxcontrib-hdl-diagrams