Deactivate e2e tests on Travis

Signed-off-by: Nabarun Pal <pal.nabarun95@gmail.com>

Author: palnabarun

.travis.yml

@@ -32,20 +32,12 @@ jobs:
     env: TOXENV=docs
   - python: 3.6
     env: TOXENV=py36
-  - python: 3.6
-    env: TOXENV=py36-functional
   - python: 3.7
     env: TOXENV=py37
-  - python: 3.7
-    env: TOXENV=py37-functional
   - python: 3.8
     env: TOXENV=py38
-  - python: 3.8
-    env: TOXENV=py38-functional
   - python: 3.9
     env: TOXENV=py39
-  - python: 3.9
-    env: TOXENV=py39-functional
   - stage: deploy
     script: skip
     deploy: