Fix linting in VoxelMapper class

Author: orlando21lara

autonomy_core/map_plan/mapper/include/mapper/voxel_mapper.h

@@ -6,6 +6,7 @@
 #include <boost/multi_array.hpp>
 #include <gtest/gtest_prod.h>
 #include <mpl_collision/map_util.h>
+#include <vector>
 
 namespace mapper {
 

autonomy_core/map_plan/mapper/src/voxel_mapper.cpp

@@ -17,7 +17,8 @@ VoxelMapper::VoxelMapper(const Eigen::Vector3d& origin,
   allocate(origin, dim);
   if (decay_times_to_empty >= 1) {
     val_decay_ =
-        std::ceil((float)(val_occ_ - val_even_) / (float)decay_times_to_empty);
+        std::ceil(static_cast<float>(val_occ_ - val_even_)
+        / static_cast<float>(decay_times_to_empty));
   } else {
     val_decay_ = 0;  // no decay
   }