Merge pull request slack-samples#54 from jammons/master

Fix doc->docs move in linting command

Author: jammons

tox.ini

@@ -30,4 +30,4 @@ commands=
 	{toxinidir}/rtmbot.py \
 	{toxinidir}/rtmbot/core.py \
 	{toxinidir}/setup.py \
-	{toxinidir}/doc/example-plugins
+	{toxinidir}/docs/example-plugins