Add --flat=true to support cpy-cli v4.0

Author: pilafmon

package.json

@@ -73,7 +73,7 @@
       "step:03": "eslint --max-warnings 0 . --ext .ts",
       "step:04": "tsc",
       "step:05": "tsc --module UMD --outDir build/umd",
-      "step:06": "cpy build/umd/html-validator.js build --rename=html-validator.umd.cjs",
+      "step:06": "cpy build/umd/html-validator.js build --rename=html-validator.umd.cjs --flat=true",
       "step:07": "add-dist-header build dist",
       "pretest": "npm-run-all step:*",
       "test": "mocha spec --timeout 5000"
@@ -87,17 +87,17 @@
    "devDependencies": {
       "@types/node": "~17.0",
       "@types/through2": "~2.0",
-      "@typescript-eslint/eslint-plugin": "~5.12",
-      "@typescript-eslint/parser": "~5.12",
+      "@typescript-eslint/eslint-plugin": "~5.14",
+      "@typescript-eslint/parser": "~5.14",
       "add-dist-header": "~0.1",
       "assert-deep-strict-equal": "~1.0",
-      "cpy-cli": "~3.1",
-      "eslint": "~8.9",
+      "cpy-cli": "~4.0",
+      "eslint": "~8.10",
       "jshint": "~2.13",
       "mocha": "~9.2",
       "npm-run-all2": "~5.0",
       "rimraf": "~3.0",
       "sinon": "~13.0",
-      "typescript": "~4.5"
+      "typescript": "~4.6"
    }
 }