key validation failure

[atodorov-storpool]

Having the following test.yaml file

:port: 1234
:host: 127.0.0.1

The following task will not update the :host, silently.

---
- name: update host
  yedit:
    src: 'test.yml'
    state: present
    key: ':host'
    value: '0.0.0.0'