Revert "Forward pyls stderr to frontend"

This reverts commit 4d646c8.

Author: lgeiger

lib/main.js

@@ -102,12 +102,6 @@ class PythonLanguageClient extends AutoLanguageClient {
         );
       }
     });
-
-    childProcess.stderr.on("data", data => {
-      atom.notifications.addWarning("Python language server", {
-        description: `${data}`
-      });
-    });
     return childProcess;
   }