Upgrade python pip libraries that no longer work with python v3.7

Author: lvarin

requirements.txt

@@ -1,8 +1,8 @@
 -e git+https://github.com/uniqueg/cwl-tes.git@57a193cabab2444bc9b661f83011837bd5ed571a#egg=cwl-tes
-cwltool==1.0.20181217162649
+cwltool==1.0.20191225192155
 drs-cli==0.2.3
 foca==0.7.0
 gunicorn==19.9.0
 py-tes==0.4.2
 python-dateutil==2.6.1
-ruamel.yaml==0.15.51
+ruamel.yaml==0.15.100