README: Fix markup of fixed-width words

README.rst

@@ -14,24 +14,24 @@ PSAMM metabolic modeling tools
 Tools related to metabolic modeling, reconstruction, data parsing and
 formatting, consistency checking, automatic gap filling, and model simulations.
 
-See NEWS_ for information on recent changes. The `master` branch
-tracks the latest release while the `develop` branch is the latest version in
-development. Please apply any pull requests to the `develop` branch when
+See NEWS_ for information on recent changes. The ``master`` branch
+tracks the latest release while the ``develop`` branch is the latest version in
+development. Please apply any pull requests to the ``develop`` branch when
 creating the pull request.
 
 .. _NEWS: NEWS.md
 
 Install
 -------
 
-Use `pip` to install (it is recommended to use a Virtualenv_):
+Use ``pip`` to install (it is recommended to use a Virtualenv_):
 
 .. code:: shell
 
     $ pip install psamm
 
-The `psamm-import` tool is developed in `a separate repository`_. After
-installing PSAMM the `psamm-import` tool can be installed using:
+The ``psamm-import`` tool is developed in `a separate repository`_. After
+installing PSAMM the ``psamm-import`` tool can be installed using:
 
 .. code:: shell