Add exclude to travis matrix for master and 3.5

Author: andrewgy8

.travis.yml

@@ -18,6 +18,9 @@ env:
     - DJANGO="Django>=2.1,<2.2" IMPORT_EXPORT_TEST_TYPE=sqlite
     - DJANGO="https://github.com/django/django/archive/master.tar.gz" IMPORT_EXPORT_TEST_TYPE=postgres
     - DJANGO="https://github.com/django/django/archive/master.tar.gz" IMPORT_EXPORT_TEST_TYPE=sqlite
+#    exclude:
+#      - python: "3.5"
+#        env: DJANGO="https://github.com/django/django/archive/master.tar.gz"
 install:
   - pip install -q $DJANGO
   - pip install tablib==0.12.1