Update README with latest version

update to node 20

README.md

@@ -19,7 +19,7 @@ The value stored inside `file` at key `field`.
 
 ## Example usage
 ```
-uses: SebRollen/toml-action@v1.0.1
+uses: SebRollen/toml-action@v1.2.0
 id: read_toml
 with:
   file: 'myfile.toml'

action.yml

@@ -14,6 +14,5 @@ outputs:
   value:
     description: 'The data stored in `field` inside `file`'
 runs:
-  using: 'node16'
+  using: 'node20'
   main: 'index.js'
-