Change the package name to channelape

[kennethjor]

This may be a pedantic nitpicky thing, but it doesn't seem right to publish the SDK using the com.shopify package. It implies an official endorsement where none exists. Perhaps this should be changed to com.channelape.shopify?

[rjdavis3]

Thanks for the suggestion @kennethjor . We mainly did this for our own internal use when this repo was closed source.

I understand where your suggestion is coming from and we will consider this for a 3.0.0 release as it would be a breaking change.