The gitleaks project is under GNU General Public License v3.0 and accepts contributions via GitHub pull requests.
Open a PR. Give the PR a descriptive title. Add some comments describing what is the purpose of the PR.
BUT before you do that!
Make sure you pass this list of requirements.
go fmt.golint.gitleaks_test.go and main.go. This is subject to change as the project evolves. Stylistically, I like having a single go file considering the size of this project (its tiny).