Correct name of Arduino CLI tool in readme

`arduino-cli` is the name of the command used to run the tool, but the readme is talking about the tool, which is named "Arduino CLI".

Author: per1234

README.md

@@ -6,7 +6,7 @@ This action checks whether Arduino sketches compile and produces a report of dat
 
 ### `cli-version`
 
-The version of `arduino-cli` to use. Default `"latest"`.
+The version of [Arduino CLI](https://github.com/arduino/arduino-cli) to use. Default `"latest"`.
 
 ### `fqbn`