GAP.jl 0.8.3 released

Today GAP.jl 0.8.3 has been released.

Diff since v0.8.2

Closed issues:

• use Scratch.jl and/or RelocatableFolders.jl for gaproot, other stuff (#728)
• Fix running tests on Nanosoldier (#818)
• Move GAPROOT out of package directory (#822)
• Manual (and/or docstrings) should list all built in conversions between GAP and Julia (#823)

Merged pull requests:

• install a GAP.Globals.Download method if possible (#820) (@ThomasBreuer)
• extend the julia_to_gap documentation (#824) (@ThomasBreuer)
• Use Scratch.jl for GAP root (#825) (@fingolfin)
• Fix banner printing (#826) (@thofma)