update poi

Author: egoist

package.json

@@ -33,12 +33,11 @@
     "homepage": "./"
   },
   "devDependencies": {
-    "@poi/plugin-storybook": "^10.0.0-beta.2",
+    "@poi/plugin-storybook": "^10.0.0-rc.2",
     "@storybook/vue": "^3.3.15",
     "babel-plugin-transform-vue-jsx": "^4",
     "bili": "^3.0.12",
-    "mini-css-extract-plugin": "^0.2.0",
-    "poi": "^10.0.0-beta.6",
+    "poi": "^10.0.0-rc.6",
     "vue-test-utils": "^1.0.0-beta.9",
     "webpack": "^4.2.0"
   },