Update LPSolver version from 4.2.0 to 4.2.1

Author: cstaelin

extensions/lpsolver-4.2.1.zip

@@ -156,7 +156,7 @@ In general, the LevelSpace syntax has been designed to align with existing NetLo
     codeName: "lpsolver"
     shortDescription: "A mixed-integer linear programming package for NetLogo"
     longDescription: "The LPSolver extension uses the lpsolve55 linear programming library to solve normal, integer and mixed-integer linear programming problems, returning the optimal solution and the shadow prices of the constraints."
-    version: "4.2.0"
+    version: "4.2.1"
     homepage: "https://github.com/cstaelin/LPSolver-Extension/"
   }
   {