change reference to action v0.3 in readme

Signed-off-by: Pranav Kalra <42278019+1arp@users.noreply.github.com>

README.md

@@ -37,7 +37,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: 1arp/create-a-file-action@0.2
+      - uses: 1arp/create-a-file-action@0.3
         with:
           path: 'src'
           file: 'foo.bar'