feat(futures_spot_price.py): add PG to futures

add PG to futures

feat(fund_em.py): add all kinds of fund in fund_em.py

add all kinds of fund in fund_em.py

feat(mplfinance): add mplfinance support

add mplfinance support

fix(interbank_rate_em.py): interbank_rate_em.py add need_page paramet…

…er to control update content

interbank_rate_em.py add need_page parameter to control update content

fix(air.py): format air interface

format air interface

docs(docs): docs

docs

fix(air_quality.py): air_quality.py

air_quality.py

docs(docs): docs

docs

fix(hk_stock_sina.py): fix: adjust hk_stock_sina, us_stock_sina

fix: adjust hk_stock_sina, us_stock_sina

feat(futures_inventory_em.py): add futures stock data

add futures stock data