New version v1.7.2

What's Changed

• TwoPoint refactor and simplification. It also fixes window function read error introduced in #396.
• Fixing readthedocs PDF build step by @mattkwiecien in #392
• Removing integration tests from coverage report. by @mattkwiecien in #393
• Add a save_to_sacc utility function by @tilmantroester in #390
• 395 reduce complexity measure in twopoint class by @marcpaterno in #396
• Update contribution guidelines by @marcpaterno in #401
• Fix documentation by @vitenti in #403

Full Changelog: v1.7.1...v1.7.2