Update .travis.yml

.travis.yml

@@ -1,9 +1,9 @@
 os: linux
 dist: xenial
+language: python
 jobs:
   include:
   - python: 3.6
-    language: python
     env: TOXENV=coveralls DEPENDENCY_INJECTOR_DEBUG_MODE=1
     install:
       - pip install tox
@@ -11,57 +11,46 @@ jobs:
       - make cythonize
     script: tox
   - python: 3.6
-    language: python
     env: TOXENV=pylint
     install: pip install tox
     script: tox
   - python: 3.6
-    language: python
     env: TOXENV=flake8
     install: pip install tox
     script: tox
   - python: 3.6
-    language: python
     env: TOXENV=pydocstyle
     install: pip install tox
     script: tox
   - python: 2.7
-    language: python
     env: TOXENV=py27
     install: pip install tox
     script: tox
   - python: 3.4
-    language: python
     env: TOXENV=py34
     install: pip install tox
     script: tox
   - python: 3.5
-    language: python
     env: TOXENV=py35
     install: pip install tox
     script: tox
   - python: 3.6
-    language: python
     env: TOXENV=py36
     install: pip install tox
     script: tox
   - python: 3.7
-    language: python
     env: TOXENV=py37
     install: pip install tox
     script: tox
   - python: 3.8
-    language: python
     env: TOXENV=py38
     install: pip install tox
     script: tox
   - python: pypy
-    language: python
     env: TOXENV=pypy
     install: pip install tox
     script: tox
   - python: pypy3
-    language: python
     env: TOXENV=pypy3
     install: pip install tox
     script: tox