DataLoader was exported but not accessible

Author: mcabbott

src/Flux.jl

@@ -47,6 +47,7 @@ include("layers/upsample.jl")
 include("outputsize.jl")
 
 include("data/Data.jl")
+using .Data
 
 include("losses/Losses.jl")
 using .Losses # TODO: stop importing Losses in Flux's namespace in v0.12

src/data/Data.jl

@@ -6,7 +6,6 @@ using Base: @propagate_inbounds
 include("dataloader.jl")
 export DataLoader
 
-
 ## TODO for v0.13: remove everything below ##############
 ## Also remove the following deps:
 ## AbstractTrees, ZipFiles, CodecZLib