fix: use inputs metadata key (#49)

Author: bradbumbalough

action.yml

@@ -8,7 +8,7 @@ branding:
 runs:
   using: node12
   main: build/index.js
-input:
+inputs:
   expo-version:
     description: The Expo CLI version to install. (use any semver/dist-tag available)
     default: latest