Added install of e1071 R package

The e1071 R package is a dependency of functions within the caret package. Without it, `caret::train` (for example) cannot be run. This pull request addresses issue #889 (https://github.com/jupyter/docker-stacks/issues/889). note - I first tried installing e1071 in the RUN command started on line 27 but that resulted in e1071 not installing (don't know why) but adding an additional RUN command led to succesful installation... So I just went with it.

Added install of e1071 R package
The e1071 R package is a dependency of functions within the caret package. Without it, `caret::train` (for example) cannot be run. This pull request addresses issue #889 (https://github.com/jupyter/docker-stacks/issues/889). note - I first tried installing e1071 in the RUN command started on line 27 but that resulted in e1071 not installing (don't know why) but adding an additional RUN command led to succesful installation... So I just went with it.
3e91889e · Tiffany A. Timbers · GitHub · d4cbf2f8 · 3e91889e
Commit 3e91889e authored Jun 20, 2019 by Tiffany A. Timbers Committed by GitHub Jun 20, 2019
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r-notebook/Dockerfile r-notebook/Dockerfile +3 -0

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--- a/r-notebook/Dockerfile
+++ b/r-notebook/Dockerfile
@@ -48,3 +48,6 @@ RUN conda install --quiet --yes \
    'r-hexbin=1.27*' && \
    conda clean --all -f -y && \
    fix-permissions $CONDA_DIR
+# Install e1071 R package (dependency of the caret R package)
+RUN conda install --quiet --yes r-e1071