build: upgrade vue-property-decorator (#439)

diff --git a/package-lock.json b/package-lock.json
index db06e62..603d6c5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11450,19 +11450,9 @@
       }
     },
     "vue-property-decorator": {
-      "version": "8.3.0",
-      "resolved": "http://nexus.yfb.sunline.cn:8099/nexus3/repository/npm-sunline/vue-property-decorator/-/vue-property-decorator-8.3.0.tgz",
-      "integrity": "sha1-U28CfcfWJvN8jYWi3ALwpsuXlEA=",
-      "requires": {
-        "vue-class-component": "^7.1.0"
-      },
-      "dependencies": {
-        "vue-class-component": {
-          "version": "7.1.0",
-          "resolved": "http://nexus.yfb.sunline.cn:8099/nexus3/repository/npm-sunline/vue-class-component/-/vue-class-component-7.1.0.tgz",
-          "integrity": "sha1-sz78sQ4XI21oT3Cx6W8ZRux5Poc="
-        }
-      }
+      "version": "9.1.2",
+      "resolved": "https://registry.npmjs.org/vue-property-decorator/-/vue-property-decorator-9.1.2.tgz",
+      "integrity": "sha512-xYA8MkZynPBGd/w5QFJ2d/NM0z/YeegMqYTphy7NJQXbZcuU6FC6AOdUAcy4SXP+YnkerC6AfH+ldg7PDk9ESQ=="
     },
     "vue-router": {
       "version": "3.0.2",
diff --git a/package.json b/package.json
index a93f159..acf78b9 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
     "vue-class-component": "^6.0.0",
     "vue-i18n": "^8.10.0",
     "vue-js-modal": "^1.3.31",
-    "vue-property-decorator": "^8.3.0",
+    "vue-property-decorator": "^9.1.2",
     "vue-router": "^3.0.1",
     "vuex": "^3.0.1",
     "vuex-class": "^0.3.1"