REMOVE: use dev build to test hinting deletes

Author: alcaeus

.travis.yml

@@ -23,8 +23,8 @@ cache:
 env:
   global:
     - DRIVER_VERSION=1.8.0
-# Todo: Remove when v1.8 has been branched
-    - DRIVER_BRANCH="master"
+    - DRIVER_REPO="https://github.com/alcaeus/mongo-php-driver"
+    - DRIVER_BRANCH="phpc-1561"
     - SERVER_DISTRO=enterprise-ubuntu1604
     - SERVER_VERSION=4.2.0
     - DEPLOYMENT=STANDALONE