Add python coverage module to DEPS

README.rst

 naclports - Ports of open source software to Native Client
 ==========================================================
 
 naclports is collection of open source libraries and applications that have
 been ported to Native Client, along with set to tools for building and
 maintaining them.
 
 Packages can be built from source or prebuilt binaries packages can be
 downloaded from the continuous build system.
 
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 installing:
 
 - zlib1g-dev:i386
 - libssl-dev:i386
 
 On older Debian/Ubuntu systems the packages were called:
 
 - lib32z1-dev
 - libssl0.9.8:i
 
-To run the presubmit checks (or ``make test``) you will also need to have
-the ``coverage`` Python module installed.
-
 
 Building
 --------
 
 Before you can build any of the package you must set the ``NACL_SDK_ROOT``
 environment variable to top directory of a version of the Native Client SDK
 (the directory containing toolchain/). This path should be absolute.
 
 The top level Makefile can be used as a quick way to build one or more
 packages. For example, ``make libvorbis`` will build ``libvorbis`` and
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 1. Directly modify the sources in ``out/build/PKG_NAME``.
 2. Build the package and verify the changes.
 3. Use ``git diff upstream.. > ../path/to/nacl.patch`` to regenerate
    the patch file.
 
 Whenever the upstream archive or patch file changes and you try to build the
 package you will be prompted to remove the existing repository and start a new
 one. This is to avoid deleting a repository that might have unsaved changed.
 
 Happy porting!