Update README with description of the new feature

Author: bartosz347

README.md

@@ -18,6 +18,7 @@ For more information on these inputs, see the [Workflow syntax for GitHub Action
 - `github-token`: Set the `${{ secrets.GITHUB_TOKEN }}` token to have the action comment the coverage summary in the pull request. This token is provided by Actions, you do not need to create your own token. Optional. Default: ``
 - `working-directory`: The working directory containing the source files referenced in the LCOV files. Optional. Default: `./`
 - `title`: A prefix before the title "LCOV of commit..." Optional. Default: ``
+- `update-comment`: Set to `true` to update previous code coverage comment if such exists. When set to `false` new comment is always created. Optional. Default: `false`
 
 ### Outputs
 None.
@@ -49,6 +50,7 @@ jobs:
         artifact-name: code-coverage-report
         github-token: ${{ secrets.GITHUB_TOKEN }}
         working-directory: apps/my-first-app
+        update-comment: true
 ```
 *Note:* Only the `pull_request` and `pull_request_target` events are supported. This action does nothing when triggered by other event types.
 
@@ -57,4 +59,4 @@ jobs:
 This is used in my opinionated [GitHub Actions: Flutter Workflows](https://github.com/zgosalvez/github-actions-flutter-workflows) repository along with other actions for a complete end-to-end DevOps experience.
 
 ## License
-The scripts and documentation in this project are released under the [MIT License](LICENSE)
+The scripts and documentation in this project are released under the [MIT License](LICENSE)

action.yml

@@ -20,9 +20,9 @@ inputs:
     description: 'A prefix before the title "LCOV of commit..." Optional. Default: ``'
     required: false
   update-comment:
-    description: Update the existing comment if it exists instead of creating a new one
+    description: 'Update the existing comment if it exists instead of creating a new one'
     required: false
-    default: false
+    default: "false"
 runs:
   using: 'node16'
   main: 'dist/main/index.js'