Not really new info for this wilmott.com crowd, but I posted something elsewhere for lay audiences.
I posted starting in January 2018, with an update in Dec. 2018 saying "I think it is more likely than not, that the recession will happen in time to be a factor for the 2020 elections. If these indicators are to be trusted then the recession looks it might happen in late 2019 or early 2020."
10YR-2YR Treasury yield spread as an economic indicator (lowest levels since before the 2008 recession)
Looking at https://fred.stlouisfed.org/series/T10Y2Y
in the timeframe when you asked your question, yes there was some short-term flattening of the yield curve but it has since kind of gone into a holding pattern for now. If you zoom out on the chart then you see many prior cases of modest chop up & down when in a holding pattern, but not the kind of flattening associated with recessions.