message: readme: Fix typo.
diff: @@ -41,7 +41,7 @@ To download the source code and build Elle by yourself, get it from GitHub.
  git clone https://github.com/infinit/elle --recursive # Clone elle and its submodules.
  ```
  -> *Note:* If you cloned it using the GitHub "clone" button, do not forget to run `git submodules update --init --recursive`!
  +> *Note:* If you cloned it using the GitHub "clone" button, do not forget to run `git submodule update --init --recursive`!
  ## Structure
  