Update .travis.yml

.travis.yml

@@ -1,18 +1,17 @@
 language: python
-python:
-  - "2.7"
-  - "3.6"
-  - "3.8"
 os: linux
 dist: xenial
 cache: pip
-install:
-  - pip install pytest
-  - pip install coverage
-before_script:
-    cd tests
+python:
+  - 2.7
+  - 3.6
+  - 3.8
+before_install:
+  - python --version
+  - pip install -U pip
+  - pip install -U pytest
+  - pip install codecov
 script:
-  - pytest test_1.py
-  - coverage run -m pytest --cov=./
+  - python -m pytest
 after_success:
-  - bash <(curl -s https://codecov.io/bash)
+  - python -m codecov