Get fingerprints and chemical representations 🧪⚗️🧪

New Functions

• chembl_downloader.download_fps downloads the pre-computed Morgan fingerprint file
• chembl_downloader.download_chemreps downloads the chembl-smiles-inchi-inchikey map
• chembl_downloader.get_chemreps_df builds on chembl_downloader.download_chemreps and loads them in a pandas dataframe

Misc

• Add isort to code quality checking
• Enable many functions with return_version to make a tuple with the version, which is useful if you're having it infer the latest version.