Fix links validation

.github/workflows/validate_links.yml

@@ -2,18 +2,18 @@ name: "Validate links"
 
 on:
   schedule:
-    - cron:  '0 0 * * *'
+    - cron:  '0 6 * * *'
 
 env:
   FORMAT_FILE: README.md
 
 jobs:
   test:
-    name: 'Validate README.md'
+    name: 'Validate links'
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
 
       - name: Validate all links from README.md
-        run: build/validate_links.sh ${FORMAT_FILE}
+        run: build/validate_links.py ${FORMAT_FILE}