Change travis

Author: ddomingof

.travis.yml

@@ -1,8 +1,9 @@
 sudo: false
 cache: pip
+
 language: python
 python:
-- 3.6
+  - 3.7
 stages:
   - lint
   - docs
@@ -13,8 +14,6 @@ jobs:
     - stage: lint
       env: TOXENV=manifest
     - env: TOXENV=flake8
-    - env: TOXENV=xenon
-    - env: TOXENV=vulture
     - env: TOXENV=pyroma
     # docs stage
     - stage: docs
@@ -30,12 +29,8 @@ matrix:
       - env: TOXENV=xenon
       - env: TOXENV=vulture
 install:
-- pip install --upgrade pip
-- pip install tox
-- pip install codecov
-- pip install coverage
+  - sh -c 'if [ "$TOXENV" = "py" ]; then pip install tox codecov; else pip install tox; fi'
 script:
-- tox
+  - tox
 after_success:
-- tox -e coverage-report
-- codecov
+  - sh -c 'if [ "$TOXENV" = "py" ]; then tox -e coverage-report; codecov; fi'