Release pyeit-1.2.0 (API cleanup and NOT backward compatible)

[liubenyuan]

What's Changed

• fix diff_pairs_mask to fit original conditions by @DavidMetzIMT in https://github.com/liubenyuan/pyEIT/pull/42
• Issue setup by @DavidMetzIMT in https://github.com/liubenyuan/pyEIT/pull/43
• Issue setup small fix + optional meas_pattern by @DavidMetzIMT in https://github.com/liubenyuan/pyEIT/pull/45
• Add PyEITMesh, PyEITProtocol, PyEITAnomaly by @DavidMetzIMT in https://github.com/liubenyuan/pyEIT/pull/47

Full Changelog: liubenyuan/pyEIT@v1.1.9...v1.2.0

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This discussion was created from the release Release pyeit-1.2.0 (API cleanup and NOT backward compatible).