Add link to blog

Signed-off-by: Peter Solymos <[email protected]>
analythium · Jun 23, 2021 · bbf4eaa · bbf4eaa
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 # Time Series Forecast
 
+> This examples was presented in the OpenFaaS blog: ["Functions for data science with R templates for OpenFaaS"](https://www.openfaas.com/blog/r-templates/)
+
 [Exponential smoothing](https://en.wikipedia.org/wiki/Exponential_smoothing) is a forecasting method.
 
 We will create a function that pulls JSON data from public [COVID-19 data API](https://github.com/analythium/covid-19#readme), fits exponential smoothing model and returns the forecast results as JSON.