v0.5.0

UltraDark v0.5.0

Diff since v0.4.1

Merged pull requests:

• feat: Include coordinate tranformations (#91) (@musoke)
• Allow initialising a soliton on a grid other that grids.psi_x. (#92) (@musoke)
• Fix init soliton (#93) (@musoke)
• refactor: Define type AbstractGrids (#94) (@musoke)
• Summary refactor (#95) (@musoke)