v3.0.0

• Updated readme logo reference
• Added tmp dependency
• Fix hexastore link in readme
• Replaced level-browserify by level, due to level-browserify not installing on newer node versions anymore and level now supporting browser environments
• Stream closing in test/triple_unicode_store_spec and test/triple_store_spec are now done on the end instead of the close event due to a double-trigger of the end event. (this may warrant another bugfix in the future)
• Updated dev dependencies
  • level-sublevel
  • multilevel
  • osenv
  • setimmediate
  • tmp
• Replaced range notation during the opening of read streams, changed from start and end to gte and lte
• Added CI based on github-actions, making new pull requests show the testing status on a known platform again