Release 1.99.0:
Release 1.99.0:

* Change `context` to `graph_name`.
* Freeze BNodes before INSERT DATA to detect an attempt to re-used a BNode across different inserts. This satisfies syntax-update-54.
* Clear BNode cache in Modify, so that different Modify blocks create separate BNodes for the same indentifier. Fixes insert-where-same-bnode.ru and insert-where-same-bnode2.ru.
* Update to ebnf 1.0 and other dependencies for 1.99.

ruby-rdf/sparql,ruby-rdf/sparql