Support list of authors for dependencies.json

[scholer]

The example-repository.json states that "The author may be a list of values", and gives this example:

		{
			"name": "Alignment",
			"details": "https://github.com/wbond/sublime_alignment",
			"author": ["wbond", "jsmith"],
			"releases": [
				{
					"sublime_text": "*",
					"tags": true
				}
			]
		},

Having a list of authors works for all .json files in package_control_channel/repository, except for entries in dependencies.json.

If an entry in dependencies.json has a list of strings as "author" value, then running the ChannelRepositoryTools: Test Default Channel command will fail with the message AssertionError: ["wbond", "jsmith"] is not an instance of <class 'str'> : author.

Is it not supported to have multiple authors listed for dependency packages defined in dependencies.json?

[FichteFoll]

This is probably an issue for the main PCC repo, but I do believe that dependencies only support a single author currently.