updated readme for force flag

Author: ThadCastl3

README.md

@@ -52,6 +52,8 @@ jobs:
           firebaseServiceAccount: "${{ secrets.FIREBASE_SERVICE_ACCOUNT }}"
           expires: 30d
           projectId: your-Firebase-project-ID
+          # Optionally add Force flag
+          # force: true
 ```
 
 ### Deploy to your live channel on merge
@@ -81,6 +83,8 @@ jobs:
           firebaseServiceAccount: "${{ secrets.FIREBASE_SERVICE_ACCOUNT }}"
           projectId: your-Firebase-project-ID
           channelId: live
+          # Optionally add Force flag
+          # force: true
 ```
 
 ## Options
@@ -151,6 +155,10 @@ The version of `firebase-tools` to use. If not specified, defaults to `latest`.
 
 Disable commenting in a PR with the preview URL.
 
+### `force` _{boolean}_
+
+Bypass the confirmation prompt.
+
 ## Outputs
 
 Values emitted by this action that can be consumed by other actions later in your workflow