Fix dependency issue.

package.json

@@ -36,7 +36,8 @@
     "decache": "^4.6.0",
     "express-http-proxy": "^1.6.3",
     "got": "^11.8.2",
-    "log-rotate": "^0.2.8"
+    "log-rotate": "^0.2.8",
+    "validate-color": "^2.2.1"
   },
   "devDependencies": {
     "@purtuga/esm-webpack-plugin": "^1.5.0",
@@ -64,7 +65,6 @@
     "svgo": "^2.8.0",
     "ts-loader": "^8.3.0",
     "typescript": "^4.3.5",
-    "validate-color": "^2.2.1",
     "webpack": "^4.46.0",
     "webpack-cli": "^3.3.12"
   },