aufs4.19--aufs5.3 will end

[J. R. Okajima]

Hello all,

I am going back to aufs development, and a new release will come early
in next year (aufs5.{8,9,10}).  Also I am going to stop supporting
aufs4.19--aufs5.3 branches.
My new development base version is aufs5.4.


J. R. Okajima