Merge branch 'traitlets-4.x' into 'master'

Pin traitlets 4.3.3

See merge request detectors/pycalibration!358

bin/slurm_calibrate.sh

@@ -40,7 +40,7 @@ export MPLBACKEND=AGG
 if [ "${uuid}" != "NO_CLUSTER" ]
 then
     ${python_path} -m IPython profile create ${uuid} --parallel
-    ${python_path} -m ipyparallel.cluster start --n=${cluster_cores} --profile=${uuid} --daemon &
+    ${python_path} -m ipyparallel.cluster start --n=${cluster_cores} --profile=${uuid} --daemonize &
     sleep 15
 fi
 

requirements.txt

@@ -36,5 +36,6 @@ scikit-learn == 0.22.2.post1
 sharedmem == 0.3.7 
 sphinx == 1.8.5
 tabulate == 0.8.6
+traitlets == 4.3.3
 unittest-xml-reporting == 3.0.2
 .