use source version of surface dynamics

1 job for travis in 9 minutes and 32 seconds (queued for 3 minutes and 24 seconds)
Status Job ID Name Coverage
  Test
failed #209407401
python2.7

00:09:32

 
Name Stage Failure
failed
python2.7 Test
Building format(s) --all.
This may take some time... done.
Processing triggers for libgdk-pixbuf2.0-0:amd64 (2.36.11-2) ...
$ source /usr/share/sagemath/bin/sage-env
$ $PIPINSTALL gmpy2==2.1.0a4
Collecting gmpy2==2.1.0a4
Could not find a version that satisfies the requirement gmpy2==2.1.0a4 (from versions: )
No matching distribution found for gmpy2==2.1.0a4
ERROR: Job failed: exit code 1