Update banner URL in README

Author: OxylabsOrg

README.md

@@ -1,6 +1,6 @@
 # Python Web Scraping Tutorial: Step-By-Step
 
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+[![Oxylabs promo code](https://raw.githubusercontent.com/oxylabs/product-integrations/refs/heads/master/Affiliate-Universal-1090x275.png)](https://oxylabs.io/pages/gitoxy?utm_source=877&utm_medium=affiliate&groupid=877&utm_content=python-web-scraping-tutorial-github&transaction_id=102f49063ab94276ae8f116d224b67)
 
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