Specify python version in bench/README.md's local server instructions

fitzgen · fitzgen · commit 1b42bf9ee6ee · 2018-01-22T11:09:28.000-08:00
diff --git a/bench/README.md b/bench/README.md
@@ -10,7 +10,7 @@ Run a local webserver from the root of the repository:
 
 ```
 $ cd source-map/
-$ python -m SimpleHTTPServer
+$ python2 -m SimpleHTTPServer # or `python3 -m http.server`
 ```
 
 Open
