Make expose settings required

Author: michpohl

action.yml

@@ -7,13 +7,11 @@ inputs:
     description: Path to your app build.gradle
     default: app/build.gradle
   expose-version-code:
-    required: false
+    required: true
     description: expose version code
-    default: 'true'
   expose-version-name:
-    required: false
+    required: true
     description: expose version name
-    default: 'true'
 runs:
   using: node12
   main: dist/index.js