README.md: Add kernel dependency for Linuxbrew
README.md: Add kernel dependency for Linuxbrew

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