setup.py: Relax sqlalchemy dependency
setup.py: Relax sqlalchemy dependency

Setting it to "< 0.8" is recommended by their website until 0.8 is stable.

Harry-R/skylines,dkm/skylines,snip/skylines,shadowoneau/skylines,shadowoneau/skylines,shadowoneau/skylines,RBE-Avionik/skylines,Turbo87/skylines,dkm/skylines,Turbo87/skylines,RBE-Avionik/skylines,Harry-R/skylines,TobiasLohner/SkyLines,skylines-project/skylines,skylines-project/skylines,Harry-R/skylines,kerel-fs/skylines,TobiasLohner/SkyLines,Harry-R/skylines,kerel-fs/skylines,RBE-Avionik/skylines,shadowoneau/skylines,snip/skylines,dkm/skylines,dkm/skylines,skylines-project/skylines,kerel-fs/skylines,Turbo87/skylines,RBE-Avionik/skylines,snip/skylines,skylines-project/skylines,TobiasLohner/SkyLines,Turbo87/skylines