Enable email notifications for now, remove slack config

.travis.yml

@@ -28,11 +28,5 @@ matrix:
 before_install:
   - gem update --system
 notifications:
-  email: false
-  slack:
-    on_pull_requests: false
-    on_success: change
-    on_failure: always
-    secure: vxwuYTr2Sy+a/C7VP06l3QQCSgsKH7mjbTqOF1cKfGgmIHwO2p1VZmNCKjOe24ILj090WmVfHdnF/MnSCQw/SD1mVNbCZFf8Vj7+fYBu26I7BfahN0jxv3S5NO1sx4ipj0cO17r21OjtD2r1XzOfKqdSkjBBCOk8+WjiqtmCXII=
-
+  email: true
 script: "bin/test"