fix: change bootstrap vue to constant version to avoid braking changes

Author: woothu

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@coreui/coreui-free-vue-admin-template",
-  "version": "2.1.2",
+  "version": "2.1.3",
   "description": "Open Source Bootstrap Admin Template",
   "author": "Łukasz Holeczek",
   "homepage": "http://coreui.io",
@@ -19,7 +19,7 @@
     "@coreui/icons": "0.3.0",
     "@coreui/vue": "^2.1.2",
     "bootstrap": "^4.2.1",
-    "bootstrap-vue": "^2.0.0-rc.11",
+    "bootstrap-vue": "2.0.0-rc.11",
     "chart.js": "^2.7.3",
     "core-js": "^2.6.2",
     "css-vars-ponyfill": "^1.16.2",