Don't warn on literals interpolated in system calls
Don't warn on literals interpolated in system calls

and other safe-ish values

cheerfulstoic/brakeman,htdc/brakeman,htdc/brakeman,bf4/brakeman,spcoder/brakeman,kbrock/brakeman,htdc/brakeman,masarakki/brakeman,spcoder/brakeman,github/brakeman,dfens/brakeman,jakeatwork/brakeman,jakeatwork/brakeman,lee-leon/brakeman,dfens/brakeman,lee-leon/brakeman,spcoder/brakeman,liqites/brakeman,jlecour/brakeman,masarakki/brakeman,kbrock/brakeman,jeffyip/brakeman,bf4/brakeman,codeclimate/brakeman-deprecated,dfens/brakeman,masarakki/brakeman,kbrock/brakeman,lee-leon/brakeman,jakeatwork/brakeman,liqites/brakeman,jlecour/brakeman,codeclimate/brakeman-deprecated,cheerfulstoic/brakeman,github/brakeman,cheerfulstoic/brakeman,jeffyip/brakeman,jlecour/brakeman,liqites/brakeman,bf4/brakeman