Fix dependencies

Author: filippomc

requirements.txt

@@ -41,7 +41,7 @@ jupyter==1.0.0
 jupyter-client==5.2.3
 jupyter-console==5.2.0
 jupyter-core==4.4.0
-jupyter_geppetto==1.0.1
+jupyter_geppetto==1.1.1
 kiwisolver==1.0.1
 lazy-object-proxy==1.4.3
 lxml==4.2.4
@@ -76,8 +76,8 @@ prometheus-client==0.3.1
 prompt-toolkit==1.0.15
 ptyprocess==0.6.0
 py==1.8.1
-pyecore==0.11.3
-pygeppetto==0.7.0
+pyecore==0.11.5
+pygeppetto==0.8.0
 Pygments==2.2.0
 pylint==2.4.4
 pynwb==1.3.0