v0.5.1

FourierFlows v0.5.1

Diff since v0.5.0

Closed issues:

• Compute solution at time t that is not necessarily an integer multiple of timestep dt (#182)
• overload @show for Params, Vars, Problem, TimeStepper (#191)

Merged pull requests:

• Adds step_until! to integrate solution up to prescribed time (#189) (@navidcy)