v0.7.6

DispersiveShallowWater v0.7.6

Diff since v0.7.5

Merged pull requests:

• Use more functions from TrixiTest.jl (#226) (@JoshuaLampert)
• Added reflecting BC for HyperbolicSGN (#228) (@cwittens)
• Fix bug when plotting with conversion function (#229) (@JoshuaLampert)
• Add dispersion relation for KdVEquation1D (#230) (@JoshuaLampert)