fix: correct profile arg in readme example (#32)

Author: thomasmichaelwallace

README.rst

@@ -41,9 +41,10 @@ Provide credentials:
     python clear_lambda_storage.py --token-key-id <access_key_id> --token-secret <secret_access_key>
 
 Alternate usage:
+
 .. code-block:: bash
 
-    python clear_lambda_storage.py --profile-id <profile_id> --num-to-keep 2
+    python clear_lambda_storage.py --profile <profile_id> --num-to-keep 2
 
 ⚡️ `Serverless Framework <https://serverless.com>`_ usage
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