Update OCP dependency to stable spec (#163)

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Co-authored-by: Daniel McKnight <[email protected]>

requirements/requirements.txt

@@ -9,7 +9,7 @@ click-default-group~=1.2
 ovos-bus-client~=0.0.3
 
 # Default OCP backend + plugins
-ovos-plugin-common-play~=0.0.6a2
+ovos-plugin-common-play~=0.0.6
 ovos-ocp-m3u-plugin~=0.0.1
 ovos-ocp-rss-plugin~=0.0.2
 ovos-ocp-files-plugin~=0.13