README: properly quote develop

mzabaluev · mzabaluev · commit 0af867c0c9f8 · 2015-11-07T11:52:55.000+02:00
diff --git a/README.rst b/README.rst
@@ -11,7 +11,7 @@ directory and run ``setup.py``::
 
   python setup.py install
 
-The `develop` command can also be used to set up the tool for in-tree
+The ``develop`` command can also be used to set up the tool for in-tree
 usage.
 
 .. _Rust: https://www.rust-lang.org/
