fix: travis file

.travis.yml

@@ -5,18 +5,9 @@ python:
   - "3.4"
   - "3.5"
   - "3.6"
-  - "nightly"
-  - "pypy-5.4.1"
-  - "pypy-5.6.0"
-  - "pypy-5.7.1"
-  - "pypy2.7-5.8.0"
-  - "pypy2.7-5.9.0"
-  - "pypy3.5-5.8.0"
-  - "pypy3.5-5.9.0"
+  - "pypy3"
 matrix:
   include:
-  - python: 3.7
-    dist: xenial
   - python: 3.8
     dist: xenial
   - python: pypy
@@ -27,10 +18,10 @@ before_install:
   - pip install --upgrade pip setuptools
 install:
   - pip install -r requirements.txt
-  - pip install coveralls
+  - if [[ $TRAVIS_PYTHON_VERSION != pypy* ]]; then pip install coveralls; fi
 env:
   - HTTPBIN=httpbin.bemisc.com
-script: coverage run --source=netius setup.py test
-after_success: coveralls
+script: if [[ $TRAVIS_PYTHON_VERSION != pypy* ]]; then coverage run --source=netius setup.py test; else python setup.py test; fi
+after_success: if [[ $TRAVIS_PYTHON_VERSION != pypy* ]]; then coveralls; fi
 notifications:
   slack: hivesolutions:838m5XXohsuxjWI0mSzghWOK