README.md: Remove git dependency
README.md: Remove git dependency

git can be installed with Linuxbrew.

Linuxbrew/brew,hanxue/linuxbrew,hanxue/linuxbrew,maxim-belkin/brew,maxim-belkin/brew,maxim-belkin/brew,Linuxbrew/brew,rwhogg/brew,Linuxbrew/brew,rwhogg/brew,hanxue/linuxbrew,rwhogg/brew,Linuxbrew/brew