Only import required function / file

Before the entire dist lib was loaded which contains the entire code,
a huge bundle.

Changing this reduces the amount of code that needs to be loaded.

Signed-off-by: Jannik Hollenbach <jannik@hollenbach.de>

index.js

@@ -1,7 +1,7 @@
 'use strict'
 
 var express = require('express')
-var swaggerUi = require('swagger-ui-dist')
+var getAbsoluteSwaggerFsPath = require('swagger-ui-dist/absolute-path')
 var favIconHtml = '<link rel="icon" type="image/png" href="./favicon-32x32.png" sizes="32x32" />' +
   '<link rel="icon" type="image/png" href="./favicon-16x16.png" sizes="16x16" />'
 var swaggerInit = ''
@@ -268,7 +268,7 @@ var swaggerInitFunction = function (swaggerDoc, opts) {
 var swaggerAssetMiddleware = options => {
   var opts = options || {}
   opts.index = false
-  return express.static(swaggerUi.getAbsoluteFSPath(), opts)
+  return express.static(getAbsoluteSwaggerFsPath(), opts)
 }
 
 var serveFiles = function (swaggerDoc, opts) {