Change to v2

Author: sinoru

README.md

@@ -16,7 +16,7 @@ Basic:
 ```yaml
 steps:
 - uses: actions/checkout@master
-- uses: sinoru/actions-setup-xcode@v1.1
+- uses: sinoru/actions-setup-xcode@v2
   with:
     xcode-version: '11.2.1' # Exact version of a Xcode version to use
     apple-id: '[email protected]' # Apple ID to download from Apple Developer when Xcode not available in local