add note about 1.20

README.md

@@ -58,6 +58,13 @@ steps:
   - run: go version
 ```
 
+> **_NOTE:_** It is better to enclose the version in single quotation mark, due to YAML parsing. When the input is specified like this  
+> ```
+>  1.20 or >=1.17.0
+>  ```
+> 1.20 is parsed as a number and it is trimmed to 1.2 that is an expected behavior for numbers. You should specify input with quotes to treat 
+> it as a string.
+
 Matching an unstable pre-release:
 
 ```yaml