message: Update milestone_v0.2.md
diff: @@ -46,7 +46,7 @@ Specific tasks are captured as GitHub Issues in the following milestones:
  - [v0.2 Alarms](https://github.com/RespiraWorks/Ventilator/milestone/11)
  - [Pressure Assist Mode](https://github.com/RespiraWorks/Ventilator/milestone/8)
  - **HFNC mode** - deleted milestone (August 2020)
  - - (stretch) [Self-test mode](https://github.com/RespiraWorks/Ventilator/milestone/10)
  + - (stretch) Self-test mode - deleted milestone (January 2021)
  - (stretch) [v0.2 Controller](https://github.com/RespiraWorks/Ventilator/milestone/13)
  