0.3.0 release (package release)

[matsmahnken]

I have closed all pending issues and included changes in branch 0.3.0 to prepare the release of ProfoundData v. 0.3.0 to CRAN.

What else do we need to do?

1. Look at Travis CI build errors that come up in some commits (1fdd02f & c5a6107) and in the pending pull request include updates for the new DB version #35
   Don't know what exactly this tool does - need some help here.
2. wait 1-2 days for the registration of the new DOI for DB version 0.3 because only then the new DOI links in the vignettes will work.

[florianhartig]

OK, I'm working on this - is there anything to update in the vignette?

[florianhartig]

Is the paper already published / has a final DOI? In this case, that should definitely be updated!

[florianhartig]

OK, the branch builds now, it was a problem with a dependency in the travis yml

[matsmahnken]

That sounds good! The paper is not published yet - but we are handing it in latest on Wednesday (06.05.): https://www.earth-syst-sci-data-discuss.net/essd-2019-220/

[matsmahnken]

The DB v. 0.3 is now released with a new DOI: http://doi.org/10.5880/PIK.2020.006
Links in the vignettes of branch 0.3.0 pointing to this DOI should be working from now on.

[matsmahnken]

I think we have everything except for the final DOI of the data paper - should we continue the push of release/version 0.3.0 to CRAN?

[matsmahnken]

The new DOI is published and the data paper is accepted for final publication. Now we can continue pushing version 0.3.0 to CRAN.
@florianhartig what else do we need to do before pushing the new version to CRAN?

[florianhartig]

ae, basically we have to ensure that everything tests out

[florianhartig]

I will create a pull request for the 0.3.0 branch and request a review from you!