use sha256 instead of md5

Author: sjoshi10

Diff for: lib/shared.js

@@ -1,6 +1,5 @@
 const Appdir = require('appdirectory');
 const rimraf = require('rimraf');
-//const md5File = require('md5-file');
 const glob = require('glob-all');
 const path = require('path');
 const fse = require('fs-extra');
@@ -102,7 +101,7 @@ function getUserCachePath(options) {
  * @param  {string} fullpath
  * @return {string}
  */
-function md5Path(fullpath) {
+function sha256Path(fullpath) {
   return sha256File(fullpath);
 }