Fix publish script due to crates.io CDN change

Author: ehuss

publish.py

@@ -32,9 +32,10 @@
 
 def already_published(name, version):
     try:
-        urllib.request.urlopen('https://crates.io/api/v1/crates/%s/%s/download' % (name, version))
+        urllib.request.urlopen('https://static.crates.io/crates/%s/%s/download' % (name, version))
     except HTTPError as e:
-        if e.code == 404:
+        # 403 and 404 are common responses to assume it is not published
+        if 400 <= e.code < 500:
             return False
         raise
     return True