Use npx for nyc coverage command

README.md

@@ -19,9 +19,19 @@ npm install nodehl7 --save
 To run tests:
 ```bash
 npm test
+```
 
+To run tests with code coverage:
+```bash
+npm run coverage
 ```
 
+This will generate coverage reports in the `coverage/` directory:
+- `coverage/lcov.info` - LCOV format for CI/GitHub Actions integration
+- `coverage/lcov-report/index.html` - HTML report for local viewing
+- `coverage/coverage-final.json` - JSON format for programmatic access
+
+
 
 ```javascript
 	const Hl7lib = require('nodehl7');