Add note about YAML parsing versions (#382)

README.md

@@ -58,6 +58,13 @@ steps:
   - run: go version
 ```
 
+> **Note**: Due to the peculiarities of YAML parsing, it is recommended to wrap the version in single quotation marks:
+> 
+> ```yaml
+>   go-version: '1.20'
+>  ```
+>  
+> The recommendation is based on the YAML parser's behavior, which interprets non-wrapped values as numbers and, in the case of version 1.20, trims it down to 1.2, which may not be very obvious.
 Matching an unstable pre-release:
 
 ```yaml