Remove node 5 from tests to speed things up
Remove node 5 from tests to speed things up

I've never seen something pass in 4 and 6 but fail in 5, and nobody should be using 5 anyway since it's not LTS or the latest stable.
calebmer/apollo-client,stevewillard/apollo-client,stevewillard/apollo-client,apollostack/apollo-client,calebmer/apollo-client,calebmer/apollo-client,convoyinc/apollo-client,cesarsolorzano/apollo-client,apollographql/apollo-client,stevewillard/apollo-client,apollostack/apollo-client,convoyinc/apollo-client,apollographql/apollo-client,convoyinc/apollo-client,cesarsolorzano/apollo-client,cesarsolorzano/apollo-client,apollostack/apollo-client