update README

Author: 417-72KI

README.md

@@ -25,15 +25,16 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Danger
-        uses: 417-72KI/danger-swiftlint@v5.7
+        uses: 417-72KI/danger-swiftlint@v5.8 # Look at the `Note for version`
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 ```
 
 ### Note for version
+- v5.8: Swift 5.8
 - v5.7: Swift 5.7
 - v5.6: Swift 5.6
-- v5.5: Swift 5.5
+- v5.5: Swift 5.5 (no longer updated)
 - v4: Swift 5.4 (no longer updated)
 - v3: Swift 5.3 (no longer updated)
 - v2: Swift 5.2 (no longer updated)