fix: mention TS 4.2 requirement

Release please 🙏
Coobaha · Feb 18, 2021 · fdc39d0 · fdc39d0
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diff --git a/README.md b/README.md
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 ## 🚧🚧 Please note it is in a very early stages, so expect imperfect things 🚧🚧
 
+## ❗TS 4.2 is required, prior versions will have type errors due to incorrect type inference
+
 This package brings makes fastify request handlers strongly typed by forcing developers to write service schema which is used to validate request params and replies.
 From this schema it does two things: