backprop 0.2.6.4

Only display out-of-date packages.

6 Reverse deps	Accepted versions
hasktorch	==0.2.5 \|\| >0.2.5
hasktorch-indef	>=0.2.5
hasktorch-zoo	==0.2.5 \|\| >0.2.5
hmatrix-backprop	>=0.2.5
nonlinear-optimization-backprop	-any
online	>=0.2.6.4 && <0.3