Fix version_between? with unspecified versions
Fix version_between? with unspecified versions

i.e., there is no RAILS_VERSION set in environment.rb.

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