v0.1.28 Release

[MHBauer]

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[MHBauer]

pending changes
Fix describe broker test (#2238)
remove from travis integration-tests which are now running in prow (#2237)
add mailing list to README (#2241)
Fix typo. (#2240)
Add ginkgo tests for svcat get classes (#2230)
Add svcat command to create user-defined cluster-scoped classes (#2190)
Add jberkhahn to OWNERS (#2245)
Include namespaced brokers in svcat get brokers (#2227)
Make the last col of get-classes and get-plans wider so we're at least 80 cols (#2226)
Enable namespaced brokers by default (#2248)
Add some dependency logic around generators. (#1966)