set some rules as warn and update deps

app/package.json

@@ -17,8 +17,8 @@
     "fork-awesome": "^1.1.7",
     "vue": "^2.6.12",
     "vue-i18n": "^8.22.1",
-    "vue-router": "^3.4.7",
-    "vuelidate": "^0.7.5",
+    "vue-router": "^3.4.8",
+    "vuelidate": "^0.7.6",
     "vuex": "^3.4.0"
   },
   "devDependencies": {
@@ -33,7 +33,7 @@
     "eslint-plugin-vue": "^6.2.2",
     "popper.js": "^1.16.0",
     "portal-vue": "^2.1.6",
-    "sass": "^1.26.11",
+    "sass": "^1.28.0",
     "sass-loader": "^8.0.0",
     "sass-resources-loader": "^2.1.1",
     "standard": "^14.3.4",
@@ -66,9 +66,17 @@
         }
       ],
       "template-curly-spacing": "off",
+      "camelcase": "warn",
       "indent": "off",
       "no-irregular-whitespace": "off",
-      "no-unused-vars": "warn"
+      "no-unused-vars": "warn",
+      "quotes": "warn",
+      "no-multiple-empty-lines": [
+        "error",
+        {
+          "max": 2
+        }
+      ]
     }
   },
   "browserslist": [