fix: apollo components registered twice, fix #1336

Author: Akryum

packages/vue-apollo-components/src/index.js

@@ -6,11 +6,8 @@ const plugin = {}
 
 export function install (app, options) {
   app.component('ApolloQuery', CApolloQuery)
-  app.component('ApolloQuery', CApolloQuery)
-  app.component('ApolloSubscribeToMore', CApolloSubscribeToMore)
   app.component('ApolloSubscribeToMore', CApolloSubscribeToMore)
   app.component('ApolloMutation', CApolloMutation)
-  app.component('ApolloMutation', CApolloMutation)
 }
 
 plugin.install = install