Accept .yml files as well as .yaml for templates.

[nicdoye]

See helm/helm-classic#306 for helm classic
and
https://kubernetes.slack.com/archives/C51E88VDG/p1520588964000061

This means charts can be made with .yml files. It's backwards compatible as helm install doesn't care about the contents of the package, and so older versions of helm can still install the packaged chart.

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[thomastaylor312]

@nicdoye This is looking good to me! I am just double checking that wasn't added in the first place for a good reason. I should get an answer soon and then I'll merge!

[kenske]

Shouldn't this be != ".yml"?

[nicdoye]

Good catch. In fact, it should be:

filepath.Ext(fileName) != ".yaml" && filepath.Ext(fileName) != ".yml"

as we only want to go to continue if it's not .yaml and it's not .yml.