Revert unnecessary changes in .travis.yml

.travis.yml

@@ -20,16 +20,13 @@ env:
     - SETUP_XVFB=true
     - PIP_DEPENDENCIES='hacking pytest pytest-qt'
 
-    # See https://github.com/brainiak/brainiak/issues/377
-    - KMP_DUPLICATE_LIB_OK=TRUE
-
     - MPLBACKEND=TkAgg  # for osx
 matrix:
   include:
     - os: osx
       env:
         - PYTEST_QT_API=pyqt5
-        - PYQT_PACKAGE='pyqt=5.6'
+        - PYQT_PACKAGE='pyqt=5'
         - PYTHON_VERSION=3.6
         - RUN_PYINSTALLER=true
     - os: linux