chore: 🤖 move core-js & vue to devDependencies

package.json

@@ -13,10 +13,7 @@
     "prepublish": "npm run build"
   },
   "main": "dist/vue-tree-list.umd.min.js",
-  "dependencies": {
-    "core-js": "^3.4.3",
-    "vue": "^2.6.10"
-  },
+  "dependencies": {},
   "devDependencies": {
     "@vue/cli-plugin-babel": "^4.1.0",
     "@vue/cli-plugin-eslint": "^4.1.0",
@@ -24,11 +21,13 @@
     "@vue/cli-service": "^4.1.0",
     "@vue/test-utils": "1.0.0-beta.29",
     "babel-eslint": "^10.0.3",
+    "core-js": "^3.4.3",
     "eslint": "^5.16.0",
     "eslint-plugin-vue": "^5.0.0",
     "jest-serializer-vue": "^2.0.2",
     "less": "^3.10.3",
     "less-loader": "^5.0.0",
+    "vue": "^2.6.10",
     "vue-template-compiler": "^2.6.10"
   },
   "eslintConfig": {