doc: add missing require to example in http2.md

kevinsimper · kjin · commit d963beb9bd0b · 2018-08-23T10:43:33.000-07:00
PR-URL: nodejs#21858 Reviewed-By: Gus Caplan <me@gus.host> Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com> Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
diff --git a/doc/api/http2.md b/doc/api/http2.md
@@ -1920,6 +1920,7 @@ instances.
 
 ```js
 const http2 = require('http2');
+const fs = require('fs');
 
 const options = {
   key: fs.readFileSync('server-key.pem'),
