remove extraneous package

Dockerfile

@@ -23,8 +23,10 @@ ENV JULIA_DEPOT_PATH=/opt/julia JULIA_PKGDIR=/opt/julia
 RUN chmod 1777 /opt/julia/logs
 
 # Add packages (and force compilation if not already done)
+# Note the line-continuation backslash ("\") at the end of each line so that
+# all packages are installed in one Julia invocation.
 RUN julia -e 'using Pkg; Pkg.add("CSV"); Pkg.add("DataFrames"); \
-        Pkg.add("FileIO"); Pkg.add("GSEE"); Pkg.add("Gurobi"); \
+        Pkg.add("FileIO"); Pkg.add("Gurobi"); \
         Pkg.add("HiGHS"); Pkg.add("JuMP"); Pkg.add("Plots"); \
         Pkg.add("PrettyTables"); Pkg.add("Random"); \
         Pkg.add("Statistics"); Pkg.add("VegaLite"); \