tee_logger.gemspec in tee_logger-2.6.0 vs tee_logger.gemspec in tee_logger-2.7.0

@@ -33,6 +33,7 @@
   spec.add_development_dependency 'pry-theme'
   spec.add_development_dependency 'rubocop'
 
   spec.add_development_dependency 'capture_stdout'
   spec.add_development_dependency 'fakefs'
+  spec.add_development_dependency 'parallel'
 end