style fix

Author: Marc Chamberland

spec/recipes/server_spec.rb

@@ -252,7 +252,7 @@
     context 'with an invalid string' do
       let(:permit_tunnel) { 'IAmNotValid' }
       it 'abort the Chef run' do
-        expect { chef_run }.not_to raise_exception('Incorrect value for attribute node[\'ssh-hardening\'][\'ssh\'][\'server\'][\'permit_tunnel\']: must be boolean or a string as defined in the sshd_config man pages, you passed "IAmNotValid"')
+        expect { chef_run }.to_not raise_exception('Incorrect value for attribute node[\'ssh-hardening\'][\'ssh\'][\'server\'][\'permit_tunnel\']: must be boolean or a string as defined in the sshd_config man pages, you passed "IAmNotValid"')
       end
     end
   end