Don't filter Twitter links when checking for broken links

Author: dstansby

check-links.py

@@ -11,8 +11,8 @@
 status_codes = [pdfx.downloader.get_status_code(ref.ref) for ref in refs]
 
 broken_links = [(ref.ref, code) for ref, code in zip(refs, status_codes) if code != 200]
-# It seems that Twitter and stackoverflow do not respond well to the link checker and throws a 400
-broken_links = [b for b in broken_links if not ('twitter.com' in b[0] or 'stackoverflow.com' in b[0])]
+# It seems that stackoverflow does not respond well to the link checker and throws a 400
+broken_links = [b for b in broken_links if not 'stackoverflow.com' in b[0]]
 
 if len(broken_links) == 0:
     sys.exit(0)