fix: augment vue rather than @vue/runtime-core (#143)

Author: danielroe

src/runtime/vue/vue.ts

@@ -364,7 +364,7 @@ function isLoadTimer() {
   })
 }
 
-declare module '@vue/runtime-core' {
+declare module 'vue' {
   interface ComponentCustomProperties {
     $chatwoot: OptionPlugin
   }