Custom command params substitution

thanks for this tool. small issue:

**Describe the bug**
on latest master (as of 12may), custom command parameter subsitution is not working. The bug does **not** appear on latest relase.

**To Reproduce**
1. build from master as of 12 may
2. use this example custom command
```
customCommands:
containers:
- name: bash
attach: true
command: 'docker exec -it {{ .Container.ID }} bash'
serviceNames: []
```
3. try to launch the custom command
`Container.ID` does not get correctly subsituted. it stay as it when sent to bash

ENV:
ubuntu 20.04, x86