v0.9.0

MethodOfLines v0.9.0

Diff since v0.8.4

Merged pull requests:

• User defined schemes - FunctionalScheme (#247) (@xtalax)
• enable dependabot for GitHub actions (#251) (@ranocha)
• Bump actions/checkout from 2 to 3 (#252) (@dependabot[bot])
• Bump actions/cache from 1 to 3 (#253) (@dependabot[bot])
• Bump codecov/codecov-action from 1 to 3 (#254) (@dependabot[bot])