Update presolve.jl (#157)

* Update presolve.jl

cc @frapac

* Update psdata

Author: amontoison

src/presolve/presolve.jl

@@ -208,6 +208,8 @@ function presolve(
   lvar, uvar = psqm.meta.lvar, psqm.meta.uvar
   lcon, ucon = psqm.meta.lcon, psqm.meta.ucon
   nvar, ncon = psqm.meta.nvar, psqm.meta.ncon
+  resize!(psdata.v, nvar)
+
   # copy if same vector
   lcon === ucon && (lcon = copy(lcon))
   lvar === uvar && (lvar = copy(lvar))