move date-fns to dependencies from devDependencies

package.json

@@ -78,6 +78,7 @@
     "cookie-parser": "^1.4.3",
     "cross-env": "^5.0.5",
     "csrf": "^3.1.0",
+    "date-fns": "^1.29.0",
     "diff": "^4.0.1",
     "elasticsearch": "^16.0.0",
     "entities": "^1.1.1",
@@ -155,7 +156,6 @@
     "core-js": "=2.6.9",
     "css-loader": "^3.0.0",
     "csv-to-markdown-table": "^1.0.1",
-    "date-fns": "^1.29.0",
     "diff2html": "^2.3.3",
     "eazy-logger": "^3.0.2",
     "eslint": "^6.0.1",