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* Add `PeakNearestTriggeringSalted` and `EventNearestTriggeringSalted` by dachengx in https://github.com/dachengx/axidence/pull/47
* Set `child_plugin` to salting plugins by dachengx in https://github.com/dachengx/axidence/pull/48
* Define `RunMeta` to help extract `start` and `end` of a run in the salting and pairing network by dachengx in https://github.com/dachengx/axidence/pull/49
* Set `PeaksPaired` to be subclass of `DownChunkingPlugin` by dachengx in https://github.com/dachengx/axidence/pull/50
* Apply Shadow Matching into `PairedPeaks` by dachengx in https://github.com/dachengx/axidence/pull/51
* Add function to preprocess shadow related features by dachengx in https://github.com/dachengx/axidence/pull/52
* Separate 2 and 3 hits pairing and add normalization factor by dachengx in https://github.com/dachengx/axidence/pull/54
* Add `samplers` module, reweight S2 of salting result by dachengx in https://github.com/dachengx/axidence/pull/56
* Implement only-S1/2 salting by dachengx in https://github.com/dachengx/axidence/pull/57
**Full Changelog**: https://github.com/dachengx/axidence/compare/v0.2.1...v0.2.2