tools: fix tools/doc/addon-verify.js regression

Introduced in commit 3f69ea5 ("tools: update marked dependency"), it
stopped the embedded addons in the documentation from getting built.

PR-URL: https://github.com/nodejs/node/pull/6652
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

tools/doc/addon-verify.js

@@ -10,7 +10,7 @@ const verifyDir = path.resolve(rootDir, 'test', 'addons');
 
 const contents = fs.readFileSync(doc).toString();
 
-const tokens = marked.lexer(contents, {});
+const tokens = marked.lexer(contents);
 let files = null;
 let id = 0;