ci: fix assets generation on windows machines (#1358)

package.json

@@ -140,7 +140,7 @@
     "bump:version": "npm --no-git-tag-version --allow-same-version version $VERSION",
     "dev": "tsc --watch",
     "docker:build": "docker build -t asyncapi/cli:latest .",
-    "generate:readme:create": "printf '\n\n# Usage\n\n<!-- usage -->\n\n# Commands\n\n<!-- commands -->\n' > scripts/README.md",
+    "generate:readme:create": "node -e \"const fs = require('fs'); fs.writeFileSync('scripts/README.md', '# Usage\\n\\n<!-- usage -->\\n\\n# Commands\\n\\n<!-- commands -->\\n');\"",
     "generate:readme:commands": "npm run build && cd scripts && cross-env DEBUG=* oclif readme",
     "generate:assets": "npm run generate:readme:toc && npm run generate:commands",
     "generate:commands": "npm run generate:readme:create && npm run generate:readme:commands && node ./scripts/updateUsageDocs.js && rimraf ./scripts/README.md",