watch.rbs in steep-1.5.0.pre.1

- old
+ new

@@ -7,10 +7,10 @@
 
       attr_reader stderr: IO
 
       attr_reader queue: Thread::Queue
 
-      attr_accessor severity_level: Symbol
+      attr_accessor severity_level: Diagnostic::LSPFormatter::severity
 
       attr_reader jobs_option: Utils::JobsOption
 
       include Utils::DriverHelper