0.35.0

What's Changed

• Improved documentation by @david-zwicker in #509
• Replaced decorator skipUnlessModule by @david-zwicker in #510
• Added pyupgrade to automatic formatting by @david-zwicker in #512
• Added Crank-Nicolson solver by @david-zwicker in #513
• Fixed vector plots of curvilinear coordinate systems by @david-zwicker in #514
• Improve argument handling of vector plots by @david-zwicker in #515
• Large improvement on differential geometry by @david-zwicker in #516
• Allow setting BCs in interpolate_to_grid by @david-zwicker in #517
• Cleaned some methods concerning geometry by @david-zwicker in #518

Full Changelog: 0.34.0...0.35.0