removed liveserver option

[live-server](https://www.npmjs.com/package/live-server) has not been
updated in over four years, and has severe security issues.

Author: moonglum

lib/cli.js

@@ -23,8 +23,6 @@ Options:
     reduce output size (where supported)
   --serve [HOST:]PORT
     serve generated files via HTTP
-  --liveserve [HOST:]PORT
-    serve generated files via HTTP with live reloading
 `.trim();
 
 exports.parseCLI = async function parseCLI() {
@@ -78,6 +76,10 @@ exports.parseCLI = async function parseCLI() {
 		liveserve: values.liveserve
 	};
 
+	if(values.liveserve) {
+		abort("The `--liveserve` option was removed. Please use `--serve` instead", 0);
+	}
+
 	if(options.watch && options.fingerprint) { // for convenience
 		console.error("you might consider disabling fingerprinting in watch " +
 				"mode to avoid littering your file system with obsolete bundles");

lib/index.js

@@ -9,7 +9,7 @@ let { SerializedRunner } = require("./util/runner");
 let browserslist = require("browserslist");
 
 exports.faucetDispatch = async function faucetDispatch(referenceDir, config,
-		{ watch, fingerprint, sourcemaps, compact, serve, liveserve }) {
+		{ watch, fingerprint, sourcemaps, compact, serve }) {
 	config = await config;
 
 	let assetManager = new AssetManager(referenceDir, {
@@ -47,13 +47,8 @@ exports.faucetDispatch = async function faucetDispatch(referenceDir, config,
 			});
 	}
 
-	if(serve && liveserve) {
-		abort("ERROR: serve and liveserve must not be used together");
-	}
 	if(serve) {
 		server.static(serve, assetManager.manifest.webRoot);
-	} else if(liveserve) {
-		server.live(liveserve, assetManager.manifest.webRoot);
 	}
 
 	return res; // notifies consumers once the initial build has completed

lib/server.js

@@ -13,13 +13,6 @@ exports.static = async (config, webroot) => {
 	console.error(`serving ${repr(webroot)} at http://${host}:${port}`);
 };
 
-exports.live = async (config, root) => {
-	let liveServer = await loadExtension("live-server", "failed to activate live-server");
-	let [host, port] = parseHost(config);
-
-	liveServer.start({ port, host, root, open: false });
-};
-
 exports._parseHost = parseHost;
 
 function parseHost(config) {