Update Twitter link from deprecated apollostack to current apollographql

Just noticed this while reviewing another PR.

Author: wincent

site/community/Community-Resources.md

@@ -24,7 +24,7 @@ Here are some helpful accounts to follow:
 - [@graphqlweekly](https://twitter.com/graphqlweekly)
 - [@graphqlnews](https://twitter.com/graphqlnews)
 - [@GraphQLStackOverflow](https://twitter.com/GraphQLatSO)
-- [@apollostack](https://twitter.com/apollostack)
+- [@apollographql](https://twitter.com/apollographql)
 - [@graphcool](https://twitter.com/graphcool)
 - [@ScapholdDotIO](https://twitter.com/ScapholdDotIO)