update jupyterlab deps, remove ipyvolume

binder/environment.yml

-name: improc_beginner
+name: improc_beginner_corr
 channels:
   - conda-forge
 dependencies:
@@ -11,7 +11,8 @@ dependencies:
   - ipywidgets
   - pandas
   - jupyter_contrib_nbextensions
-  - ipyvolume
   - ipympl
+  - nbgrader
   - pip:
-    - requests
+    - requests
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+    - lckr-jupyterlab-variableinspector
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binder/postBuild

 python installation/download_data.py
 
 mkdir PyImageCourse_beginner
-mv *.ipynb PyImageCourse_beginner/
-
+mv *.ipynb PyImageCourse_beginner/
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-jupyter labextension install @jupyter-widgets/jupyterlab-manager --no-build
-jupyter labextension install ipyvolume --no-build
-jupyter labextension install jupyter-threejs --no-build
-jupyter labextension install itk-jupyter-widgets --no-build
-jupyter labextension install @lckr/jupyterlab_variableinspector --no-build
-jupyter labextension install jupyter-matplotlib --no-build
-
-jupyter lab build
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