'let us know at on our support page' to 'let us know on our support page' (#308)

Author: MuleHakim

README.md

@@ -287,7 +287,7 @@ See the [usage guide](https://platform.openai.com/docs/guides/images) for more d
 
 In general, we want to support the versions of Python that our
 customers are using. If you run into problems with any version
-issues, please let us know at on our [support page](https://help.openai.com/en/).
+issues, please let us know on our [support page](https://help.openai.com/en/).
 
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