Reduce version pinpointing to ease compatility with other environments on our JupyterHub

environment.yml

@@ -6,17 +6,17 @@ channels:
 - conda-forge
 
 dependencies:
-- python=3.6.7
+- python #=3.6.7
 - pip
 - sqlalchemy==1.2.18 # necessary versions for nbgrader
-- notebook==5.7.8
-- pandas==0.24.2
-- numpy==1.16.2
-- matplotlib==3.0.3
-- scipy==1.2.1
-- pillow==6.0.0
-- scikit-learn==0.20.3
-- scikit-image==0.15.0
+- notebook#==5.7.8
+- pandas#==0.24.2
+- numpy#==1.16.2
+- matplotlib#==3.0.3
+- scipy#==1.2.1
+- pillow#==6.0.0
+- scikit-learn#==0.20.3
+- scikit-image#==0.15.0
 - nbgrader==0.6.1
 - pip:
   # upsud version branch of nbgrader