The International Committee on Taxonomy of Viruses has designated the novel coronavirus first detected in Wuhan as SARS-CoV-2, replacing its working designation of 2019-nCoV. The related respiratory disease is designated COVID-19 as announced by the WHO; I could not locate the statement on the WHO's English website, but it has been Tweeted from @WHO and is being widely reported elsewhere.
Since the older designation is now deprecated, I suggest we rename the tag coronavirus-2019-ncov to sars-cov-2-virus or some such.
The naming of diseases and their agents is fraught due to the dangers of stigma and panic, and because misinformation spreads so quickly. The news media's careless use of coronavirus has led to various conspiracy-oriented posts appearing on my social media feeds; the term applies to a whole family of viruses, and past incidents and research related to coronaviruses in general are being misapplied to the current outbreak. Thus, in my opinion I think we should avoid the term "coronavirus" in the tag name altogether.