v0.6.1

• Data update: NCI Thesaurus (21.10d)
• Removed some redundant/non-informative columns of main data frame (oncopharmadb)
  • target_chembl_id
  • drug_synonyms
  • drug_description
  • drug_moa
  • drug_tradenames
  • cancer_drug
• Documented exported data objects (oncopharmadb and oncopharma_synonyms)
• Annotated gonadotropin releasing hormone analogues with hormone_therapy label
• Added platinum_compound as a dedicated drug category (and as a column in oncopharmadb)
  • New argument is_platinum_compound to get_onco_drugs()