* When passing `t`, choose the closest iteration by RemiLehe in https://github.com/openPMD/openPMD-viewer/pull/347
* README: Remove Travis-CI Badges by ax3l in https://github.com/openPMD/openPMD-viewer/pull/369
* Adding attributes to the FieldMetaInformation object by juliettepech in https://github.com/openPMD/openPMD-viewer/pull/372
* Sphinx documentation by RemiLehe in https://github.com/openPMD/openPMD-viewer/pull/303
* Add readthedoc configuration by RemiLehe in https://github.com/openPMD/openPMD-viewer/pull/375
* setup.py: no upper version of openPMD-api by ax3l in https://github.com/openPMD/openPMD-viewer/pull/378
* Docs: correct 'get_mean_gamma' description in tutorials by IlianCS in https://github.com/openPMD/openPMD-viewer/pull/379
* Do not use pyflakes for version 3.7 by RemiLehe in https://github.com/openPMD/openPMD-viewer/pull/385
* Impose that user always passes iteration or t by RemiLehe in https://github.com/openPMD/openPMD-viewer/pull/383
* Docs: Improve tutorials by adding basic analysis functions by IlianCS in https://github.com/openPMD/openPMD-viewer/pull/382
* Improve get_laser_waist by soerenjalas in https://github.com/openPMD/openPMD-viewer/pull/359
* Python 3.8+ by ax3l in https://github.com/openPMD/openPMD-viewer/pull/387
* Update version number and CHANGELOG.md by RemiLehe in https://github.com/openPMD/openPMD-viewer/pull/386
* Add all record attributes to `FieldMetaInformation` by AngelFP in https://github.com/openPMD/openPMD-viewer/pull/390
* Support complex data in `thetaMode` geometry by AngelFP in https://github.com/openPMD/openPMD-viewer/pull/389
* fix get_data for weighting in momentum reader by PrometheusPi in https://github.com/openPMD/openPMD-viewer/pull/393
* Simplify names of radial particle components by AngelFP in https://github.com/openPMD/openPMD-viewer/pull/392
* Close 396 warning when reading particle data by RemiLehe in https://github.com/openPMD/openPMD-viewer/pull/398
* Support reading of 'rt' lasy files by RemiLehe in https://github.com/openPMD/openPMD-viewer/pull/371
**Full Changelog**: https://github.com/openPMD/openPMD-viewer/compare/1.7.0...1.9.0