Allowing the cov tests did not properly work. Trying again.

.travis.yml

@@ -18,13 +18,15 @@ matrix:
   allow_failures:
     - python: pypy
     - env: TOXENV=sith
-    - env: TOXENV=cov
+    - env:
+        - TOXENV=cov
+        - JEDI_TEST_ENVIRONMENT=36
     - python: 3.7-dev
   include:
     - python: 3.5
       env:
         - TOXENV=cov
-        - JEDI_TEST_ENVIRONMENT=35
+        - JEDI_TEST_ENVIRONMENT=36
     - python: 3.5
       env: TOXENV=sith
     - python: pypy