Fix a typo in the README

diff --git a/README.md b/README.md
index b5074a870327b5f35bc2d5ed1095539f2f946874..fb6d941bbd2c45da19c117d700be0c238f371ca4 100644 (file)
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ $ git clone --recursive https://github.com/carlhuda/cargo
 or
 ```
 $ git submodule init
-$ git submodule upgrade
+$ git submodule update
 ```
 Then it's as simple as ```make``` and you're ready to go.