chore(gh-release): add prerelease flag and find right zip (#4488)

Add a --prerelease flag so we can run gh-release.js manually and mark releases as prerelease.
Also, get the correct zip file.

build/gh-release.js

@@ -2,12 +2,23 @@ var ghrelease = require('gh-release');
 var currentChangelog = require('./current-changelog.js');
 var safeParse = require('safe-json-parse/tuple');
 var pkg = require('../package.json')
+var minimist = require('minimist');
+
+var args = minimist(process.argv.slice(2), {
+  boolean: ['prerelease'],
+  default: {
+    prerelease: false
+  },
+  alias: {
+    p: 'prerelease'
+  }
+}
 
 var options = {
   owner: 'videojs',
   repo: 'video.js',
   body: currentChangelog(),
-  assets: ['./dist/videojs-'+pkg.version+'.zip'],
+  assets: ['./dist/video-js-'+pkg.version+'.zip'],
   endpoint: 'https://api.github.com',
   auth: {
     username: process.env.VJS_GITHUB_USER,
@@ -18,7 +29,7 @@ var options = {
 var tuple = safeParse(process.env.npm_config_argv);
 var npmargs = tuple[0] ? [] : tuple[1].cooked;
 
-if (npmargs.some(function(arg) { return /next/.test(arg); })) {
+if (args.prerelease || npmargs.some(function(arg) { return /next/.test(arg); })) {
   options.prerelease = true;
 }