Pin readme-renderer to latest version 17.2

pyup-bot · pyup-bot · commit dd2949011162 · 2017-06-15T11:53:16.000+09:00
diff --git a/requirements.txt b/requirements.txt
@@ -5,4 +5,4 @@ isort==4.2.15
 mock==2.0.0
 nose==1.3.7
 pymemcache==1.4.3
-readme_renderer
+readme-renderer==17.2
