Changelog

apollo-server-core: Add persisted queries PR#1149
apollo-server-core: added BadUserInputError
apollo-server-core: breaking gql is exported from gql-tag and ApolloServer requires a DocumentNode PR#1146
apollo-server-core: accept Request object in runQuery PR#1108
apollo-server-core: move query parse into runQuery and no longer accept GraphQL AST over the wire PR#1097
apollo-server-core: custom errors allow instanceof checks PR#1074
apollo-server-core: move subscriptions options into listen PR#1059
apollo-server-core: Replace console.error with logFunction for opt-in logging PR #1024
apollo-server-core: context creation can be async and errors are formatted to include error code PR #1024
apollo-server-core: add mocks parameter to the base constructor(applies to all variants) PR#1017
apollo-server-core: Remove printing of stack traces with debug option and include response in logging functionPR#1018