CI: disable doclinks temporally

since Travis is failing to check github.com with forbidden error,
but it doesn't fail locally
(https://travis-ci.org/torproject/sbws/jobs/511862070#L1938).

.travis.yml

@@ -9,7 +9,7 @@ script:
   - tox
   # This is not in included in the tox envlist, in order to don't need Internet
   # when running tox
-  - tox -e doclinks
+  # - tox -e doclinks
   - tox -e clean
 
 before_install:

tox.ini

@@ -4,7 +4,7 @@ envlist = py35, py36, inst, setup, unit, integration, lint, stats, doc
 
 [travis]
 python =
-    3.5: py35, inst, setup, unit, integration, lint, doc, doclinks
+    3.5: py35, inst, setup, unit, integration, lint, doc
     3.6: py36, inst, setup, unit, integration
 
 [testenv]