Make note about setting up Ubuntu Dev Environment (beeware#138)

In Ubuntu, you need to install `libpython3.4-testsuite` to be able to run the test suite. Without it, running the tests will just fail.
gautamworah96 · Jun 2, 2016 · d912116 · d912116
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diff --git a/docs/internals/contributing.rst b/docs/internals/contributing.rst
@@ -20,6 +20,9 @@ Github fork .
 As with the getting started guide, these instructions will assume that you
 have Python3, a Java 7 or Java 8 JDK, and Apache ANT installed, and have virtualenv available for use.
 
+**Note:** If you are on Ubuntu, you will need to install ``libpython3.4-testsuite`` to be able to run the test suite.
+This can be done by running ``apt-get install libpython3.4-testsuite``.
+
 Start by forking VOC into your own Github repository; then
 check out your fork to your own computer into a development directory: