fix(international_futures.md): fix url format

fix url format

feat(futures_spot_stock.py): add futures_spot_stock.py

add futures_spot_stock.py

docs(docs): update mindmap

update mindmap

fix(cons.py): add PG into cons.py map_dict

add PG into cons.py map_dict

fix(cot.py): fix cot.py czce keys

fix cot.py czce keys

fix(cot.py): fix covid_19_dxy and cot.py 20081015

fix covid_19_dxy and cot.py 20081015

feat(jyfm_tools_func.py): jyfm_tools_func.py

jyfm_tools_func.py

docs(docs): docs

docs

Merge branch 'master' into develop

feat(index_vix): add index_vix

add index_vix