I changed some wording towards the end of the Guards section of the readme.

I fixed a typo:

instead a method --> instead of a method

I also changed the wording a bit to improve the clarity of the sentence:

since this Class responds to call --> if the Class responds to call

The final result:

You can invoke a Class instead of a method if the Class responds to call

My IDE also trimmed some trailing whitespace throughout the document.

I'm hopeful that the added clarity will help non-native English speakers' ability to use and understand this gem. 😀 Thank you so much for creating and maintaining such a useful gem!