v0.6.0

GeophysicalFlows v0.6.0

Diff since v0.5.2

Closed issues:

• Drop CuArrays.jl from deps and move to CUDA.jl (#96)

Merged pull requests:

• Adds julia v1.5 tests in CI (#95) (@navidcy)
• Using CUDA.jl (#98) (@navidcy)
• we don't use varsexpression anymore (#99) (@navidcy)
• Don't import (the now useless) FourierFlows.getfieldspecs (#100) (@navidcy)