fluent 0.7.0 (April 11, 2018)

• Remove fluent.migrate.

  The migration code has been moved into its own repository:
  fluent-migration. See bug 1445881 for more information about the move.

• Add the ref field to VariantExpression. (#62)

  The Identifier-typed id field has been removed. The new ref field contains the MessageReference node rigt now. The range of valid expressions for ref may be extended in the future.

• Fix missing Spans on Function nodes.