• (Addition) Add holds handle to Model (from @kjetilk).
  
• (Addition) Added bgp export function in Attean::RDF with associated
  tests (#125 from @kjetilk).
  
• (Update) Export using Exporter::Tiny instead of Exporter.pm (#122 from
  @tobyink).
  
• (Update) Expose count_quads_estimate method at the model level.
  
• (Update) Make count_quad_estimate accessible from TripleModel (#124 from
  @kjetilk).