TTim version 0.6.6

What's Changed

• Invlap by @mbakker7 in #42
• Formatting black+isort by @dbrakenhoff in #44
• Add pyproject.toml by @dbrakenhoff in #45
• New documentation by @dbrakenhoff in #48
• Update README.md by @mbakker7 in #50
• update workflows by @dbrakenhoff in #49
• 51 providing an unsolved timmlmodel raises error by @mbakker7 in #53
• Improve docs by @dbrakenhoff in #54
• added howto pumpingtests by @mbakker7 in #57
• Move latest docs in dev by @mbakker7 in #59
• Update pumping test notebooks by @dbrakenhoff in #60
• Update master for release v0.6.6 by @mbakker7 in #56

Many thanks to @vcantarella for making and converting the pumping test notebooks.

Full Changelog: v0.6.5...v0.6.6