disable phasefield tests on Sympy 1.1

11 jobs for oldsympy in 83 minutes and 19 seconds (queued for 2 seconds)
Name Stage Failure
minimal-windows Test The script exceeded the maximum execution time set for the job
Installing collected packages: pystencils
Successfully installed pystencils-0.2.9.dev142+39209309a6
You are using pip version 10.0.1, however version 20.0.1 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.
$ python -c "import numpy"
$ python setup.py quicktest
running quicktest
WARNING: Timed out waiting for the build to finish
ERROR: Job failed: execution took longer than 1h0m0s seconds