Merge pull request #1888 from Lukasa/cert_verify_cb

Expose SSL_CTX_set_cert_verify_callback
diff --git a/.travis.yml b/.travis.yml
index 71efd8f..c7413ea 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -120,3 +120,5 @@
             - "irc.freenode.org#cryptography-dev"
         use_notice: true
         skip_join: true
+    webhooks:
+        - https://buildtimetrend.herokuapp.com/travis