改demo doc，vue peer deps

Author: lycHub

.npmrc

@@ -1,2 +1,2 @@
-registry=https://registry.npm.taobao.org
-sass_binary_site=http://cdn.npm.taobao.org/dist/node-sass
+# registry=https://registry.npm.taobao.org
+# sass_binary_site=http://cdn.npm.taobao.org/dist/node-sass

package.json

@@ -1,6 +1,6 @@
 {
   "name": "vue-virtual-tree",
-  "version": "3.1.0",
+  "version": "3.1.1",
   "description": "Tree component for large amount of data, base on Vue3",
   "scripts": {
     "serve": "vue-cli-service serve --port 4200",
@@ -15,7 +15,9 @@
   ],
   "dependencies": {
     "core-js": "^3.6.5",
-    "lodash.clonedeep": "^4.5.0",
+    "lodash.clonedeep": "^4.5.0"
+  },
+  "peerDependencies": {
     "vue": "^3.0.0"
   },
   "devDependencies": {