Add parameter to listContributors for anonymous contributors

[augustd]

Fixes #1905

Description

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[bitwiseman]

Please fix CI failures

[bitwiseman]

Suggested change

	return root().createRequest().withUrlPath(getApiTailUrl("contributors")).toIterable(Contributor[].class, null);
	return listContributors(null);

[bitwiseman]

Suggested change

	public PagedIterable<Contributor> listContributors(boolean includeAnonymous) throws IOException {
	if (includeAnonymous) {
	return root().createRequest()
	.withUrlPath(getApiTailUrl("contributors"))
	.with("anon", "true")
	.toIterable(Contributor[].class, null);
	}
	return listContributors();
	public PagedIterable<Contributor> listContributors(Boolean includeAnonymous) throws IOException {
	return root().createRequest()
	.withUrlPath(getApiTailUrl("contributors"))
	.with("anon", includeAnonymous)
	.toIterable(Contributor[].class, null);