Update HACKING.rst instructions for running the tests

A recent version of ``virtualenv`` is needed to run the tests. I was getting failures when v1.6.4. I am not positive that 1.8.2 is the lowest version necessary--it is the version that was installed when I ran ``pip install -U virtualenv``.
saltstack · Oct 17, 2012 · 981465a · 981465a
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@@ -154,6 +154,10 @@ If it is less than 2047, you should increase it with::
 Running the tests
 ~~~~~~~~~~~~~~~~~
 
+You will need a recent version of ``virtualenv``::
+
+    pip install "virtualenv>=1.8.2"
+
 You will need ``mock`` to run the tests::
 
     pip install mock