Wrong default value for `cname` in `schema.json`

[JohannesHoppe]

Error: Property 'cname' does not match the schema. 'false' should be a 'string'.

Solved it by adding cname flag manually as github.com along with base-href.

Originally posted by @batbrain9392 in #145 (comment)

see

angular-cli-ghpages/src/deploy/schema.json

Lines 51 to 55 in 76753b0

	"cname": {
	"type": "string",
	"description": "Generate a CNAME file for the specified domain.",
	"default": false
	},

[JohannesHoppe]

The typings here are indeed wrong, an empty string should do the trick.