Added:
- Non-linear correction script for the (HL)LHC Insertion Regions Resonance Driving Terms, including feed-down effects.
Changed:
- The package's license has been moved from `GPLv3` to `MIT`.
Note: if one wishes to extend the `IRNL` correction script to a different accelerator,
there are valuable pointers in the following
[PR comment](https://github.com/pylhc/PyLHC/pull/74#issuecomment-966212021).