lib/makeTwemojiRenderer.js
function normalizeProtocol(protocol) {
	if (protocol && protocol.length > 0 && protocol.charAt(protocol.length - 1) !== ':') {
		return protocol + ':'
	}
	return protocol
}
function normalizeProtocol(protocol) {
	if (protocol && protocol.length > 0 && protocol.charAt(protocol.length - 1) !== ':') {
		return protocol + ':'
	}
	return protocol
}
function normalizeProtocol ( protocol ) { if ( protocol && protocol . length > 0 && protocol . charAt ( protocol . length - 1 ) !== ':' ) { return protocol + ':' } return protocol }
Accept protocol with or without a colon
Accept protocol with or without a colon