Inform about end of support for restcoutries.eu

Add easy to find information to readme, quoted from issues apilayer#251 (apilayer#251 (comment)), apilayer#252 (apilayer#252 (comment)) and apilayer#253 (apilayer#253 (comment))
meta72 · Oct 12, 2021 · ce84388 · ce84388
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+⚠ restcountries.eu is not supported anymore ⚠
+-------
+
+> Message from apilayer support: We no longer support restcountries.eu; however, we do offer a free tier of a similar API on countrylayer.com. See https://countrylayer.com/documentation/
+
 REST Countries
 =======