0.7.0

New in this release:

• Most of JsonVisitor is now automatically generated.
• The experimental GraphQL schema definition syntax from graphql/graphql-spec#90 is now supported. Because the syntax is experimental, it is not on by default. To use the support, call graphql::parseStringWithExperimentalSchemaSupport or graphQL::parseFileWithExperimentalSchemaSupport.
• Location information in the AST is now more correct.
• ast::Node::accept() is now const.