instantiate template for shortest path generation

Former-commit-id: e5f505b8d4 [formerly 7146af99e3]
Former-commit-id: 24e3f3d92a

src/utility/shortestPaths.cpp

@@ -332,6 +332,9 @@ namespace storm {
                     std::cout << " ]" << std::endl;
                 }
             }
+
+
+            template class ShortestPathsGenerator<double>;
         }
     }
 }