Merge pull request #573 from manuels/patch-1

Add support for DTLSv1
diff --git a/cryptography/hazmat/bindings/openssl/ssl.py b/cryptography/hazmat/bindings/openssl/ssl.py
index 2b4e54f..6c5795b 100644
--- a/cryptography/hazmat/bindings/openssl/ssl.py
+++ b/cryptography/hazmat/bindings/openssl/ssl.py
@@ -268,6 +268,10 @@
 const SSL_METHOD *TLSv1_server_method(void);
 const SSL_METHOD *TLSv1_client_method(void);
 
+const SSL_METHOD *DTLSv1_method(void);
+const SSL_METHOD *DTLSv1_server_method(void);
+const SSL_METHOD *DTLSv1_client_method(void);
+
 const SSL_METHOD *SSLv23_method(void);
 const SSL_METHOD *SSLv23_server_method(void);
 const SSL_METHOD *SSLv23_client_method(void);