repl: add http2 to built-in libs in REPL

PR-URL: nodejs#83
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: yosuke-furukawa

lib/internal/module.js

@@ -78,8 +78,8 @@ function stripShebang(content) {
 
 const builtinLibs = [
   'assert', 'async_hooks', 'buffer', 'child_process', 'cluster', 'crypto',
-  'dgram', 'dns', 'domain', 'events', 'fs', 'http', 'https', 'net', 'os',
-  'path', 'punycode', 'querystring', 'readline', 'repl', 'stream',
+  'dgram', 'dns', 'domain', 'events', 'fs', 'http', 'http2', 'https', 'net',
+  'os', 'path', 'punycode', 'querystring', 'readline', 'repl', 'stream',
   'string_decoder', 'tls', 'tty', 'url', 'util', 'v8', 'vm', 'zlib'
 ];