Mention JLD2 in README

[mprat]

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Is future development encouraged to use https://github.com/simonster/JLD2.jl? If so, can it be mentioned in the README so that Google searches don't lead to a dead end package =). Alternatively, if this package is no longer maintained, can it be deprecated for later versions of Julia and documented as such?

[briochemc]

+1

Also, it would be nice to have a little example for people like me who already had saved data in JLD format (which versions 0.7 and 1.0 cannot access since JLD fails on these version, right?). I mean something like:

1. Use julia version 0.6 to make JLD2 formats of your JLD data files:

   using JLD, JLD2
   JLD.@load "My_JLD_Data.jld" variable1 variable2 # etc.
   JLD2.@save "My_JLD_Data.jld2" variable1 variable2 # etc.
   

2. Then you can use version 0.7 (version 1.0 even?) with JLD2.jl on your new-format .jld2 data files.