allow skin.yaml or skin.yml in ~/.k9s

[dremerten]

Currently extension must be .yml.

Steps to reproduce the behavior:
1.cd ~/.k9s/
2. create skin.yaml with some color values
3. save file exit start k9s
-- skin.yaml is not used
4. Rename skin.yaml to skin.yml
5. Relaunch k9s

Expected behavior
Use either extension .yaml or .yml

Versions

• OS: linux x86_64
• K9s [0.16.1]

[BarakStout]

Is this something we want? What is the issue with having is set to be skin.yml???

[placintaalexandru]

@BarakStout , there are often times, myself included, when you use .yaml or .yml interchangeably
Usually if K9S' skins do not work, it's not intuitive that you typed yaml instead of yml, thus this request