def remove(files, opts = {})
      args = []
      args << '-f' if opts[:force]
      args << [*files]
      command(:rm, args)
    end
def remove(files, opts = {})
      args = []
      args << '-f' if opts[:force]
      args << [*files]
      command(:rm, args)
    end
Remove the files from the Index

 @param [Array<String>] files the file names to remove from the Index

 @option opts :force if exists and not false, will force the removal of the files

 @return [String] the output of the git command