Want to let the user know they don't have to parse the inputs.

Author: peterp

README.md

@@ -50,7 +50,7 @@ jobs:
 - `VERCEL_ACCESS_TOKEN` (required)
 - `VERCEL_PROJECT_ID` (required)
 
-### Inputs
+### Optional Inputs
 
 ```yaml
   # Mixed action inputs
@@ -105,4 +105,4 @@ database-url:
   description: Instant database url
 deployment-url:
   description: Vercel preview deployment url
-```
+```