Update to Julia 1.4

Makefile

@@ -0,0 +1,30 @@
+# Makefile
+# convert .jl to .ipynb to .html
+
+# key commands:
+root = ~/.julia/conda/3/bin/
+jt = $(root)/jupytext
+jup = $(root)/jupyter
+# --allow-errors
+juprun = $(jup) nbconvert --execute \
+	--config=config/jupyter_nbconvert_config.py
+juphtm = $(juprun) --to HTML
+
+# https://nbconvert.readthedocs.io/
+# https://nbconvert.readthedocs.io/en/latest/usage.html
+# https://nbconvert.readthedocs.io/en/latest/execute_api.html?highlight=execute#module-nbconvert.preprocessors
+
+jl := $(wildcard */*.jl)
+ip := $(jl:%.jl=%.ipynb)
+ht := $(jl:%.jl=%.html)
+
+
+all: $(ip) $(ht)
+
+
+$(ip): %.ipynb: %.jl
+	$(jt) --to notebook $? # -o $@
+
+
+$(ht): %.html: %.ipynb
+	$(juphtm) $? # --output $@

config/jupyter_nbconvert_config.py

@@ -0,0 +1,3 @@
+# https://community.dominodatalab.com/discussion/253/faq-preventing-jupyter-timeout-errors-when-running-notebooks-as-a-batch-scheduled-job
+
+c.ExecutePreprocessor.timeout = 111