Remove Beta development status from classifiers
Remove Beta development status from classifiers

Remove the Beta trove classifier to be in line with other Oslo
projects. While there is a Production/Stable status none of the other
Oslo projects use it.

https://pypi.python.org/pypi?%3Aaction=list_classifiers

Change-Id: I3689c6faf60be49ce2bf19f45e977dd64798954b

ozamiatin/oslo.messaging,ozamiatin/oslo.messaging