current beta release vs master maint 2.6.1

[Michael Ploujnikov]

Is the README (https://github.com/jwiegley/ledger/blob/
eda6cbd0146d371653feec70e0eb3ee4e4c56379/README.textile) still correct
about the designation of the branches? I'm confused as to the
difference between current and beta. Also, it doesn't feel natural
that maint is a beta branch while master is the current (stable)
release since master is the latest. Have these meanings been changed?