Add pip step to tests documentation

JoshData · JoshData · commit 960d4c1b1c40 · 2020-04-15T18:46:34.000-04:00
diff --git a/README.rst b/README.rst
@@ -391,6 +391,7 @@ Tests can be run using
 
 ::
 
+    pip install -r test_requirements.txt 
     make test
 
 For Project Maintainers
