travis: move pyqt5 to allowed failures

Author: thocevar

.travis.yml

@@ -15,12 +15,14 @@ matrix:
           env: BUILD_DOCS=true
           python: '3.4'
           script: source $TRAVIS_BUILD_DIR/.travis/build_doc.sh
-        - python: '3.5'
+        - &pyqt5
+          python: '3.5'
           env: PYQT5=true
           dist: trusty
           addons: { apt: { packages: [] } }
     allow_failures:
         - *pylint
+        - *pyqt5
     fast_finish: true
 
 cache: