v0.2.4

What's Changed

• [pre-commit.ci] pre-commit autoupdate by @pre-commit-ci in #117
• remove repr for connection instance by @PythonFZ in #126
• add __len__ to CombinedConnection by @PythonFZ in #127
• raise error on append and extend connections by @PythonFZ in #128

Full Changelog: v0.2.3...v0.2.4