Scaffoldgraph

* Installation updates (install optional requirements with pip)
* from_dataframe can read from existing rdkit Mols in specified smiles column

Bug-fixes
* Static files not included in installation

**New Features:**
* Cytoscape Visualizer (requires ipycytoscape)
* Further visualization utilities
* Basic diversity picker function

**Other:**
* CI updates
* Minor bug fixes
* Limit to Python >= 3.6

* Minor bug-fixes
* Make compatible with the most recent release of RDKit `2020.09.01`

- Bug fixes
- New features
- Improved documentation
- Improved tests

Bug Fixes:
- Fixed SMILES CLI issue 2
- Fixed Pandas DataFrame supplier

New Features:
- multiple new functions for improved useability https://github.com/UCLCheminformatics/ScaffoldGraph/commit/e41458112ce7b88b8551f68c86f3429cea184db2
- tqdm progress bar now works in Jupyter https://github.com/UCLCheminformatics/ScaffoldGraph/commit/3b57fbed573497ec5ed05212d416e702777a404f