Fixed the build

Author: sumagnadas

.travis.yml

@@ -46,6 +46,6 @@ install:
 script:
   - if [ "$TRAVIS_OS_NAME" = "windows" ];then pytest -vxrs --cov=./; fi
   - if [ "$TRAVIS_OS_NAME" = "osx" ]; then pytest -vxrs --cov=./; fi
+  - python -c 'from PySide2.QtWidgets import QApplication; QApplication([])'
   - if [ "$TRAVIS_OS_NAME" = "linux" ]; then pytest -vxrs; fi
   - codecov
-  - python -c 'from PyQt5.QtWidgets import QApplication; QApplication([])'