POI does not support to compute the conflict

[guilhermebodin]

ERROR: LoadError: ArgumentError: The optimizer ParametricOptInterface.Optimizer{Float64, Xpress.Optimizer} does not support `compute_conflict!`
Stacktrace:
 [1] compute_conflict!(optimizer::ParametricOptInterface.Optimizer{Float64, Xpress.Optimizer})
   @ MathOptInterface C:\Users\guilhermebodin\.julia\packages\MathOptInterface\mz9FK\src\MathOptInterface.jl:108
 [2] compute_conflict!(model::Model)
   @ JuMP C:\Users\guilhermebodin\.julia\packages\JuMP\glJ0u\src\optimizer_interface.jl:502

Probably a simple new dispatch would do the trick

[odow]

I got waylaid by #151, but then this should be sufficient:

diff --git a/src/MOI_wrapper.jl b/src/MOI_wrapper.jl
index 4915b22..34b1850 100644
--- a/src/MOI_wrapper.jl
+++ b/src/MOI_wrapper.jl
@@ -1363,3 +1363,19 @@ function MOI.optimize!(model::Optimizer)
     end
     return
 end
+
+#
+# compute_conflict!
+#
+
+function MOI.compute_conflict!(model::Optimizer)
+    return MOI.compute_conflict!(model.optimizer)
+end
+
+function MOI.get(
+    model::Optimizer,
+    attr::MOI.ConstraintConflictStatus,
+    ci::MOI.ConstraintIndex{MOI.VariableIndex,<:MOI.Parameter},
+)
+    return MOI.MAYBE_IN_CONFLICT
+end