Adapt the release guide too

jenshnielsen · jenshnielsen · commit 6213e14ab413 · 2015-11-11T14:20:35.000Z
diff --git a/doc/devel/release_guide.rst b/doc/devel/release_guide.rst
@@ -13,7 +13,7 @@ A guide for developers who are doing a matplotlib release.
 Testing
 =======
 
-* Run all of the regression tests by running ``python setup.py test`` script
+* Run all of the regression tests by running ``python tests.py``
   at the root of the source tree.
 
 * Run :file:`unit/memleak_hawaii3.py` and make sure there are no
