Update build-index.py

Author: tabatkins

bin/build-index.py

@@ -135,7 +135,7 @@ def create_symlink(shortname, spec_folder):
 # ------------------------------------------------------------------------------
 
 
-bikeshed.constants.setErrorLevel("nothing")
+bikeshed.messages.state.dieOn = "nothing"
 
 specgroups = defaultdict(list)
 timestamps = defaultdict(list)
@@ -204,4 +204,4 @@ def create_symlink(shortname, spec_folder):
 <script>
 window.location.href = "https://drafts.csswg.org";
 </script>
-""")
+""")