fix: npm audit issues

Author: Andrey Chalkin

lib/commands/serve.js

@@ -4,7 +4,7 @@ const serveStatic = require("serve-static");
 const connect = require("connect");
 const livereload = require("connect-livereload");
 const lrserver = require("livereload");
-const opn = require("opn");
+const open = require("open");
 const chalk = require("chalk");
 const util = require("../util/index");
 const getPort = require("get-port");
@@ -59,7 +59,7 @@ module.exports = function(
         .watch(path);
 
       if (openInBrowser) {
-        opn(`http://localhost:${port}`);
+        open(`http://localhost:${port}`);
       }
 
       const msg =

lib/commands/start.js

@@ -3,7 +3,6 @@
 const connect = require("connect");
 const serveStatic = require("serve-static");
 const Renderer = require("docsify-server-renderer");
-const fs = require("fs");
 const util = require("../util/index");
 const chalk = require("chalk");
 const LRU = require("lru-cache");