Added marked and commonmark.js to benchmarks.

README.md

@@ -28,6 +28,8 @@ Scott Chacon and Ben Straub):
 |---------------|-------|--------|
 | Markdown.pl   | 5.162s|   286.8|
 | PHP Markdown  | 1.021s|    56.7|
+| commonmark.js | 0.292s|    16.2|
+| marked        | 0.239s|    13.3|
 | discount      | 0.090s|     5.0|
 | cmark         | 0.020s|     1.1|
 | sundown       | 0.018s|     1.0|