Breaking: drop github-username dependency.

[mshima]

I don’t think github-username is useful enough to worth 6,5MB.

[mshima]

What do you think @UlisesGascon @JoshuaKGoldberg?

[JoshuaKGoldberg]

Heh, yeah, the package bringing in all of @octokit/rest seems a bit much. There's only one place I see it being used:

generator/src/actions/user.ts

Lines 45 to 53 in a98a140

	/**
	* Retrieves GitHub's username from the GitHub API
	* @return Resolved with the GitHub username or rejected if unable to
	* get the information
	*/
	username: async () => {
	const email = await this.git.email();
	return email ? githubUsername(email) : email;
	},

Since it's not using the token option, and so is purely an anonymous API call, I think we could just call the API manually. 👍 from me, would like to hear @UlisesGascon's opinion too.

[UlisesGascon]

@octokit/rest seems the way to go 👍