Instruct to use virtualenv instead of mkvirtualenv

git-svn-id: https://svn.apache.org/repos/asf/allura/site/trunk@1691581 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/README.md b/README.md
index ed9db54..0a84728 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 
 # Bootstrapping pelican
 
-    ~$ mkvirtualenv allura-site
+    ~$ virtualenv allura-site
     ~$ pip install pelican markdown
 
 # Working on site