TST: merged readme and docs environments

tox.ini

@@ -1,7 +1,7 @@
-# Configuration for automated testing.
+# Configuration for automated testing, building, and releasing.
 
 [tox]
-envlist = py36, docs, readme
+envlist = py36, docs
 
 [testenv]
 passenv =
@@ -20,17 +20,12 @@ deps =
     pandas
     ipython
     matplotlib
+    readme_renderer
     sphinx_rtd_theme
 commands =
+    python ../setup.py check -r -s
     sphinx-build -E -W -n -b html -d build/doctrees source build/html
 
-[testenv:readme]
-skip_install = True
-deps =
-    readme_renderer
-commands =
-    python setup.py check -r -s
-
 [testenv:build]
 skip_install = True
 deps =