Merge pull request #1007 from alex/warning-stacklevel

Warn at the right stacklevel
diff --git a/cryptography/utils.py b/cryptography/utils.py
index 5566d12..484eec9 100644
--- a/cryptography/utils.py
+++ b/cryptography/utils.py
@@ -16,7 +16,7 @@
 import sys
 
 
-DeprecatedIn04 = PendingDeprecationWarning
+DeprecatedIn04 = DeprecationWarning
 
 
 def register_interface(iface):