Update README.md

Author: hollerloudly

README.md

@@ -27,7 +27,7 @@ Refer to below link for deeper information on the API itself.
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-* [Sematext Cloud API Reference](https://github.com/sematext/sematext-api-client-go "API Reference")
+* [Sematext Cloud API Reference](https://sematext.com/docs/api/ "API Reference")
 
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