fix: mcp install command with environment variables

Author: cr7258

README.md

@@ -249,7 +249,7 @@ mcp install server.py
 mcp install server.py --name "My Analytics Server"
 
 # Environment variables
-mcp install server.py -e API_KEY=abc123 -e DB_URL=postgres://...
+mcp install server.py -v API_KEY=abc123 -v DB_URL=postgres://...
 mcp install server.py -f .env
 ```
 
@@ -480,4 +480,4 @@ We are passionate about supporting contributors of all levels of experience and
 
 ## License
 
-This project is licensed under the MIT License - see the LICENSE file for details.
+This project is licensed under the MIT License - see the LICENSE file for details.