Revert "Update package.json"

This reverts commit 726a8124a182af2f3af6dcac39c368cfbea4062f.

package.json

@@ -29,7 +29,7 @@
     "vue-cropper": "^0.4.8",
     "vue-draggable-resizable": "^2.3.0",
     "vue-i18n": "^8.7.0",
-    "vue-loader": "^14.2.4",
+    "vue-loader": "^15.7.0",
     "vue-ls": "^3.2.0",
     "vue-photo-preview": "^1.1.3",
     "vue-print-nb-jeecg": "^1.0.9",