Updated changelog too
## In development
+- Updated collection in BASH lesson file to 9 (PacketPushers)
- Replaced all individual snippet indices with 'this' keyword [#221](https://github.com/nre-learning/nrelabs-curriculum/pull/221)
- Rename syringe.yaml to lesson.meta.yaml, and move lessons into descriptive subdirs [#222](https://github.com/nre-learning/nrelabs-curriculum/pull/222)
- Prepare curriculum for collections [#224](https://github.com/nre-learning/nrelabs-curriculum/pull/224)
