Allow PATCH in enable-cors

[dwelch2344]

While using ingress.kubernetes.io/enable-cors is awesome and super easy to get started with, PATCH was left out. Not sure if this was intentional or not, but would love to see it available.

Thoughts?

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[k8s-reviewable]

This change is 

[dwelch2344]

Should be validated now for CLA

[coveralls]

Coverage remained the same at 43.586% when pulling 8abbd1a on dwelch2344:master into cda42f9 on kubernetes:master.

[aledbf]

/lgtm

[aledbf]

@dwelch2344 thanks!

[dwelch2344]

Woohoo! Okay, forgive my noobness – how can I track when this goes out? we'll eagerly be awaiting :)

[aledbf]

@dwelch2344 we need to release a new version to fix an issue so before the end of the week