Update to Julia 1.3.1

Updated the install commands for Julia to use version 1.3.1 instead of 1.2.0

datascience-notebook/Dockerfile

@@ -23,12 +23,12 @@ RUN apt-get update && \
 # install Julia packages in /opt/julia instead of $HOME
 ENV JULIA_DEPOT_PATH=/opt/julia
 ENV JULIA_PKGDIR=/opt/julia
-ENV JULIA_VERSION=1.2.0
+ENV JULIA_VERSION=1.3.1
 
 RUN mkdir /opt/julia-${JULIA_VERSION} && \
     cd /tmp && \
     wget -q https://julialang-s3.julialang.org/bin/linux/x64/`echo ${JULIA_VERSION} | cut -d. -f 1,2`/julia-${JULIA_VERSION}-linux-x86_64.tar.gz && \
-    echo "926ced5dec5d726ed0d2919e849ff084a320882fb67ab048385849f9483afc47 *julia-${JULIA_VERSION}-linux-x86_64.tar.gz" | sha256sum -c - && \
+    echo "faa707c8343780a6fe5eaf13490355e8190acf8e2c189b9e7ecbddb0fa2643ad *julia-${JULIA_VERSION}-linux-x86_64.tar.gz" | sha256sum -c - && \
     tar xzf julia-${JULIA_VERSION}-linux-x86_64.tar.gz -C /opt/julia-${JULIA_VERSION} --strip-components=1 && \
     rm /tmp/julia-${JULIA_VERSION}-linux-x86_64.tar.gz
 RUN ln -fs /opt/julia-*/bin/julia /usr/local/bin/julia
@@ -79,7 +79,7 @@ RUN conda install --quiet --yes \
 # taking effect properly on the .local folder in the jovyan home dir.
 RUN julia -e 'import Pkg; Pkg.update()' && \
     (test $TEST_ONLY_BUILD || julia -e 'import Pkg; Pkg.add("HDF5")') && \
-    julia -e "using Pkg; pkg\"add IJulia\"; pkg\"precompile\"" && \ 
+    julia -e "using Pkg; pkg\"add IJulia\"; pkg\"precompile\"" && \
     # move kernelspec out of home \
     mv $HOME/.local/share/jupyter/kernels/julia* $CONDA_DIR/share/jupyter/kernels/ && \
     chmod -R go+rx $CONDA_DIR/share/jupyter && \