fix(types): missing client on subscribe

types/options.d.ts

@@ -79,6 +79,7 @@ interface VueApolloSubscribeToMoreOptions extends SubscribeToMoreOptions {
 
 interface VueApolloSubscriptionDefinition extends SubscriptionOptions {
   variables?: QueryVariables
+  client?: string
 }
 
 export type VueApolloSubscriptionProperty =

types/test/App.ts

@@ -148,7 +148,8 @@ export const hey = Vue.extend({
           return {
             foo: this.meow
           }
-        }
+        },
+        client: 'foo'
       }
     }
   },