docs(readme): add missing fastify-dependency-integration input (#142)

Signed-off-by: Frazer Smith <frazer.dev@icloud.com>

Author: Fdawgs

README.md

@@ -65,6 +65,7 @@ jobs:
 | Input Name                         | Required   | Type    | Default   | Description                                                                        |
 | ---------------------------------- | ---------- | ------- | --------- | ---------------------------------------------------------------------------------- |
 | `auto-merge-exclude`                 | false      | string  | `fastify` | Provide a semicolon separated list of packages that you do not want to be auto-merged. |
+| `fastify-dependency-integration`     | false      | boolean | `false`   | Set to `true` to run fastify tests with the (proposed) changes. |
 | `license-check`                      | false      | boolean | `false`   | Set to `true` to check that a repository's production dependencies use permissive licenses: 0BSD, Apache-2.0, BSD-2-Clause, BSD-3-Clause, MIT, or ISC. |
 | `license-check-allowed-additional`   | false      | string  |           | Provide a semicolon separated list of SPDX-license identifiers that you want to additionally allow. |
 | `lint`                               | false      | boolean | `false`   | Set to `true` to run the `lint` script in a repository's `package.json`.           |