sunpy 3.0.4 and 3.0.3

[David Stansby]

Dear all,

The SunPy developers present to you the latest releases of the sunpy core package, versions 3.0.4 (long term support) and 3.1.3. For changelogs see:

• https://docs.sunpy.org/en/v3.0.4/whatsnew/changelog.html (3.0.4)
• https://docs.sunpy.org/en/v3.1.3/whatsnew/changelog.html (3.1.3)
  

Please enjoy,
The SunPy Developers