🚨Fix Rubocop lint errors

lib/custom_exceptions/report.rb

@@ -3,31 +3,31 @@
 module CustomExceptions::Report
   class InvalidIdentity < CustomExceptions::Base
     def message
-      "Invalid type"
+      'Invalid type'
     end
   end
 
   class IdentityNotFound < CustomExceptions::Base
     def message
-      "Type with the specified id not found"
+      'Type with the specified id not found'
     end
   end
 
   class MetricNotFound < CustomExceptions::Base
     def message
-      "Metric for the specified type not found"
+      'Metric for the specified type not found'
     end
   end
 
   class InvalidStartTime < CustomExceptions::Base
     def message
-      "Invalid start_time"
+      'Invalid start_time'
     end
   end
 
   class InvalidEndTime < CustomExceptions::Base
     def message
-      "Invalid end_time"
+      'Invalid end_time'
     end
   end
 end