Log Message:
net/ruby-train-core: update to 3.4.9

3.4.9 (2021-01-27)

* Powershell process keep running with local train transport. #660
  (Vasu1105)

3.4.8 (2021-01-26)

* su - USER command execution support & change transport_options to
  attr_accessor #636 (vsingh-msys)