fix: remove incorrect us-east-1 default from --region docs (#253)

Author: anasstahr

README.md

@@ -98,7 +98,7 @@ docker build -t mcp-proxy-for-aws .
 | ---	                 | ---	                                                                                                                                                                                                                                    | ---	                                                                        |---	|
 | `--service`	         | AWS service name for SigV4 signing, if omitted we try to infer this from the url	                                                                                                                                                       | Inferred from endpoint if not provided	                                     |No	|
 | `--profile`	         | AWS profile for AWS credentials to use	                                                                                                                                                                                                 | Uses `AWS_PROFILE` environment variable if not set                          |No	|
-| `--region`	          | AWS region to use	                                                                                                                                                                                                                      | Uses `AWS_REGION` environment variable if not set, defaults to `us-east-1`	 |No	|
+| `--region`	          | AWS region to use	                                                                                                                                                                                                                      | Uses `AWS_REGION` environment variable if not set	                           |No	|
 | `--metadata`	        | Metadata to inject into MCP requests as key=value pairs (e.g., `--metadata KEY1=value1 KEY2=value2`)                                                                                                                                    | `AWS_REGION` is automatically injected based on `--region` if not provided    |No	|
 | `--read-only`	       | Disable tools which may require write permissions (tools which DO NOT require write permissions are annotated with [`readOnlyHint=true`](https://modelcontextprotocol.io/specification/2025-06-18/schema#toolannotations-readonlyhint)) | `False`	                                                                    |No	|
 | `--retries`          | Configures number of retries done when calling upstream services, setting this to 0 disables retries.                                                                                                                                   | 0                                                                           |No |

mcp_proxy_for_aws/cli.py

@@ -97,7 +97,7 @@ def parse_args():
 
     parser.add_argument(
         '--region',
-        help='AWS region to sign (uses AWS_REGION environment variable if not provided, with final fallback to us-east-1)',
+        help='AWS region to sign (uses AWS_REGION environment variable if not provided)',
         default=None,
     )