Updates for v1.3.0 according to contribution guidelines

[bvreede]

• version number updated in CITATION.cff and __version__.py
• changelog updated with info from PR Changed orography to geopotential #98 and Add integration testing #102

Ready for new release.

[codecov]

Codecov Report

Merging #104 (cf9f8c2) into master (2240bc1) will increase coverage by 0.62%.
The diff coverage is 97.72%.

@@            Coverage Diff             @@
##           master     #104      +/-   ##
==========================================
+ Coverage   98.32%   98.94%   +0.62%     
==========================================
  Files           7        7              
  Lines         358      380      +22     
==========================================
+ Hits          352      376      +24     
+ Misses          6        4       -2     

Impacted Files	Coverage Δ
era5cli/cli.py	98.03% <87.50%> (+1.16%)	⬆️
era5cli/__version__.py	100.00% <100.00%> (ø)
era5cli/fetch.py	99.45% <100.00%> (+0.65%)	⬆️
era5cli/inputref.py	100.00% <100.00%> (ø)

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[sverhoeven]

Most changes look good to me, I just have a small nitpick see inline suggestions.

Also is geopotential/orograph change something worth mentioning in /README.md?

[bvreede]

Most changes look good to me, I just have a small nitpick see inline suggestions.

That is not a nitpick, that is a good catch of a complete misinterpretation on my side! Thanks :)

Also is geopotential/orograph change something worth mentioning in /README.md?

I'm on the fence. Decided against it because it doesn't add additional features, just makes era5cli compatible again with changes in CDS, and our readme is not very elaborate... but I can easily be persuaded :)