Please see JuMP v0.19.2 ⇒ v0.18.6 - #3 by odow.
This is an unfortunate result of Pkg choosing to downgrade JuMP in order to update GLPK. Run
rm GLPK
up JuMP@0.19
add GLPK@0.10
It will be fixed by an upcoming release of JuMP.
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