relnotes: add 6.6
There are no differences between the rc and the actual release.
Added signature for changeset
26c57e7a0890
Added tag 6.6 for changeset
26c57e7a0890
py3: pass unicode strings to hasattr() throughout
I guess we missed these instances because they're not covered by tests.
Added signature for changeset
27055614b685
Added tag 6.6rc0 for changeset
27055614b685