ci(travis): re-enable fedora

* Automated using `ssf-formula` (v0.7.0)

Author: myii

.travis.yml

@@ -32,7 +32,7 @@ env:
     # - INSTANCE: default-debian-9-2018-3-py2
     # - INSTANCE: default-ubuntu-1604-2018-3-py2
     # - INSTANCE: default-centos-7-2018-3-py2
-    # - INSTANCE: default-fedora-29-2018-3-py2
+    - INSTANCE: default-fedora-29-2018-3-py2
     - INSTANCE: default-opensuse-leap-42-2018-3-py2
     # - INSTANCE: default-debian-8-2017-7-py2
     # - INSTANCE: default-ubuntu-1604-2017-7-py2