Docker bug fix (#194)

Author: borundev

Dockerfile

@@ -1,11 +1,11 @@
-FROM jupyter/scipy-notebook:1386e2046833
+FROM jupyter/base-notebook:lab-2.2.5
 
 USER root
 # python3 setup
-RUN apt-get update && apt-get install -y graphviz
+RUN apt-get update && apt-get install -y graphviz git
 
 USER jovyan
 
 RUN git clone https://github.com/dask/dask-tutorial.git ./dask-tutorial
-RUN cd dask-tutorial && conda env update -f binder/environment.yml && . binder/postBuild && cd ..
+RUN cd dask-tutorial && conda env update -n base -f binder/environment.yml --prune && . binder/postBuild && cd ..
 RUN rm dask-tutorial/github_deploy_key_dask_dask_tutorial.enc