Add changelog

sunpy · Mar 30, 2021 · aed8fca · aed8fca
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+Several `sunpy.map.GenericMap` attributes have been updated to return `None`
+when the relevant piece of FITS metadata is missing. These are:
+
+- `~sunpy.map.GenericMap.exposure_time`, previously defaulted to zero seconds.
+- `~sunpy.map.GenericMap.measurement`, previously defaulted to zero.
+- `~sunpy.map.GenericMap.waveunit`, previously defaulted to ``u.one``.
+- `~sunpy.map.GenericMap.wavelength`, previously defaulted to zero.