add alias domain & cert

[todo]

lambda-edge-image-resize/cloudfront/main.tf

Lines 41 to 46 in 54a2f68

	# TODO: add alias domain & cert
	viewer_certificate {
	cloudfront_default_certificate = true
	}
	price_class = "PriceClass_200"

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This issue was generated by todo based on a TODO comment in 54a2f68 when #2 was merged. cc @Wintus.