rubocop fix

Author: DannyBen

spec/bashly/message_strings_spec.rb

@@ -21,7 +21,7 @@
     end
 
     it 'returns values from the user config, falling back to defaults' do
-      expect(subject[:usage]).to eq "== Usage =="
+      expect(subject[:usage]).to eq '== Usage =='
     end
   end
 end