Update README.md

Author: username71

README.md

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 # EonTrading-Webull
 
+https://www.webull.com/ is for the international one
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+https://www.webull.hk/ is for the Hong Kong one
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 doc: https://developer.webull.hk/api-doc/
 
 order request doc : https://developer.webull.hk/api-doc/trade/order/place-order