GAP.jl 0.9.4 released

Today GAP.jl 0.9.4 has been released.

Diff since v0.9.3

Merged pull requests:

• do not mention fmpz in the JuliaInterface manual (#857) (@ThomasBreuer)
• Tweak @gapattribute to not require ‘import GAP: @gapwrap’ (#858) (@fingolfin)
• Adjust JuliaExperimental to the great renaming in Nemo (#859) (@fingolfin)