===================
- We adopted a rule that all method names must include a verb, and all class
properties must be a noun [286]. As a result, we renamed the following methods:
* ``LightCurve.cdpp()`` is now ``LightCurve.estimate_cdpp()``
* ``LightCurve.periodogram()`` is now ``LightCurve.to_periodogram()``
* ``LichtCurve.properties()`` is now ``LightCurve.show_properties()``
* ``TargetPixelFile.aperture_photometry()`` is now
``TargetPixelFile.extract_aperture_photometry()``
* ``TargetPixelFile.centroids()`` is now ``TargetPixelFile.estimate_centroids()``
* ``TargetPixelFile.header()`` is now a property.
- Added ``Periodogram.smooth()`` [288].
- ``Periodogram.estimate_snr()`` was renamed to ``Periodogram.p.flatten()`` [290].
- Lightkurve can now read in light curve files produced using
``LightCurveFile.to_fits()`` [297].