Remove the "gtm4wp.com" credits/comment from the website?

[danielmat3]

Hey there! How I can remove the "gtm4wp.com" credits/comment from the website? Thanks a bunch!

This is what I am talking about:

[duracelltomi]

Since this is a free project, I am sure you understand that this small reference is probably a good way to say thank you.
If you would like to remove it, you can write a PHP code that catches output of the HTML header and does a search/replace in the code.