update requirements.txt - packages now avail. via pip
-# not installable via pip
-roadrunner
+# installable via pip
+libroadrunner
+rrplugins
+tesbml
+tesedml
+tecombine
antimony
phrasedml
sbml2matlab
-
-# installable via pip
-python-libsbml
-python-libsedml
ipywidgets
bioservices
matplotlib
