traffic v2.6.6

Feature improvement:

• trajectory generation framework by @alafage
• time_buffer parameter in Impala with @espinielli

Bug fix:

• Link to @junzis aircraft database

Minor changes:

• Fully typed library (--strict flag for mypy)

New Contributors

• @ElSabio97 made their first contribution in #162

Full Changelog: v2.6.5...v2.6.6